Begin running CIFuzz on standard library modules

[sethmlarson]

Now that Python core team has adopted the "python3-libraries" OSS-Fuzz definitions into the python org we can start running these as a part of the CPython CI.

Since there are so many of these "fuzzers" we don't want to waste CI time unnecessarily, so I will design the CI fuzzer to only run when a specific module is modified. The GitHub workflow configuration file will be generate from a template, similar to other generated files to avoid needing to manually upkeep all the conditionals.