chore: add dune-project file

[yosefAlsuhaibani]

This file is needed in order to pin semgrep-interfaces as an opam package by git has as opposed to by path (i.e git+https//...#<sha> vs ./cli/interfaces/semgrep_interfaces/)

• I ran make setup && make to update the generated code after editing a .atd file (TODO: have a CI check)
• I made sure we're still backward compatible with old versions of the CLI.
  For example, the Semgrep backend need to still be able to consume data
  generated by Semgrep 1.50.0.
  See https://atd.readthedocs.io/en/latest/atdgen-tutorial.html#smooth-protocol-upgrades
  Note that the types related to the semgrep-core JSON output or the
  semgrep-core RPC do not need to be backward compatible!
• Any accompanying changes in semgrep-proprietary are approved and ready to merge once this PR is merged

[github-actions]

Backwards compatibility summary:

Checking backward compatibility of semgrep_output_v1.atd against past version v1.100.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.101.0
Skipping v1.102.0 because commit 1c82453e89e0b569630e48ddde015e201df0e5f9 has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.103.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.104.0
Skipping v1.106.0 because commit 5e0c767ec323f3f2356d3bf8dbdf7c7836497d8a has already been checked
Skipping v1.107.0 because commit 5e0c767ec323f3f2356d3bf8dbdf7c7836497d8a has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.108.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.109.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.110.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.111.0
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Skipping v1.117.0 because commit 5c6a8f569d16845ba10c27d17eeae68e481340d6 has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.118.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.119.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.120.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.123.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.124.0
Skipping v1.124.1 because commit 75ab2f389a373af38a2a29872b4fa1c654d182f0 has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.125.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.127.0
Skipping v1.127.1 because commit 80fa4d2466c737b570c4f363edadc2b336e5696d has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.130.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.131.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.132.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.132.1
Checking backward compatibility of semgrep_output_v1.atd against past version v1.133.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.134.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.135.0
Skipping v1.136.0 because commit 85c728ef38c1aef822f28035078fa2671ec7d10a has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.137.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.137.1
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Skipping v1.140.0 because commit 8baadf6b8604b59c9a660dbb371726c12a3666b8 has already been checked
Skipping v1.141.0 because commit 8baadf6b8604b59c9a660dbb371726c12a3666b8 has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.142.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.143.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.144.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.75.0
Skipping v1.76.0 because commit 9102031608aa4154e1c37f557550ec4eabc8780c has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.77.0
Skipping v1.78.0 because commit dcb5d77b420ddee61f58aadd3c2c7aef38778154 has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.79.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.81.0
Skipping v1.82.0 because commit 9e0f3bec26b07b4fb6753a32cb75277f45f2572c has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.84.0
Skipping v1.84.1 because commit 3daef49297ada205359cc1d2996354c94b628b0d has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.85.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.87.0
Skipping v1.88.0 because commit 512c0bd97db59c48a5705b2741662a338776e438 has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.90.0
Checking backward compatibility of semgrep_output_v1.atd against past version v1.91.0
Skipping v1.92.0 because commit 2351c5e528cb7430422208dc66707894c066b508 has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.93.0
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Skipping v1.99.0 because commit 60809032a2e39742f42910d46b3e5dd305b8b8cf has already been checked

[kopecs]

imo if we do this we should consider generating the generated code by rule in dune, rather than checking it in (current way may still be better given it eliminates a dependency on the generator(s) if you're not changing this, but we should think about it)