Add documentation with MkDocs to VAPython

This MR add a documentation site to VAPython. For this it uses MkDocs and MkDocstrings. The docs for the generated VA interface are stored in a separate toml file. Maybe in the future, this doc file can be used as a unified documentation for all modules that implement some sort of VA interface.

added documentation enhancement labels

assigned to @pascal.palenda

added 2 commits

• b59b8ac2 - Fix: build by setting fixed python version in default evn
• 761d7cf9 - Feat: add docs build step in CI

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added 1 commit

• 2d6b585e - Fix: build issue

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added 1 commit

• 5c622d29 - Fix: add toml to build env

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added 1 commit

• 4de118e8 - Fix: version specific toml loading

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added 1 commit

• b95dbccd - Revert "Fix: build by setting fixed python version in default evn"

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added 73 commits

• b95dbccd...fae5d2b6 - 44 commits from branch feature/pure-python
• fae5d2b6...014dc93d - 19 earlier commits
• c5eb33d2 - Doc: `_types`
• 6178910c - Doc: functions
• 54ccc567 - Feat: add some todos
• 43cad87a - Feat: disable file documentation for doc-coverage
• 178fc6fe - Style: doc formatting
• d53b7c9c - Style: doc formatting
• 4fa2633d - Chore: add punctuation to doc strings
• 04a722ae - Style: doc formatting
• 744ef5aa - Doc: add todo
• 4cf5ec6d - Chore: update `docstr_coverage_badge`

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Todo:

• Adapt parameter names when VANet!4 (merged) is finished.

added 2 commits

• 2f8e0212 - Feat: adapt doc to VANet changes
• 345fc7d2 - Feat: improve return doc generation

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added 1 commit

• 36b0c405 - Fix: unit tests with new proto files

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Removed the dependency on VANet!4 (merged) so that in can be merged into !4 (merged)

marked this merge request as ready

Maybe we should improve the included documentation site. Currently, it's just the proof of concept site. Then again, the main website might be enough.

requested review from @schaefer