Add oeo-tools as submodule and build imports in the CI

[areleu]

Summary of the discussion

Discussed in https://etherpad.wikimedia.org/p/oeo-dev-82

Type of change (CHANGELOG.md)

Update

• Updated import build system

Workflow checklist

Automation

Closes #

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• 📝 Update the CHANGELOG.md
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• 🐙 Provided feedback and show sufficient appreciation for the work done

[areleu]

The changes in the imported modules are according to the current scripts if there is something that is not desireable let me know so I can take a look specifically. I suspect the differences come from the fact that we don't fix the version of the imported ontology.

[areleu]

I would wait until merging: OpenEnergyPlatform/oeo-tools#18 before merging this, so long I will keep it as a draft.

[areleu]

oeo-tools has to be rebased in this PR, the contents of the imports in the latest version should be added too.