Add documentation create/update community providers

[marcosmarxm]

Add documentation to help contributors to add and update community providers.
I'm pulling the first version to check if the sections are okay and get some feedback.
I'm not a native english speaker so throughout the week I'll dedicate myself to writing more clearly, corrections are welcome.

Resolves issue #10386 and extends closed PR #13193.

I added the following sections so far:

• How-to creating a new community provider
  • Initial Code and Unit Tests
  • Update Airflow validation tests (core/providers_manager.py and CI count providers)
  • Integration tests
  • Documentation
• How-to Update a community provider

I'll focus to add the following items:

• directory structure (possibly automated templates or script to create them)
• usage scenarios for connections in hooks (see discussion in Standardising hooks / connections and adding TTLs #12128)
• Information about what is required:
  • hooks
  • operators/sensors/transfers
  • unit tests with mocks
  • integration tests if applicable
  • example dags for examples and their use (examples, howtos, system tests)
  • howto guides
• relation with backport providers.

[potiuk]

Nice! cool stuff. I've added few comments and clarifications! looking forward for fixes and happy to merge it!

[marcosmarxm]

@potiuk #14176 create a CONTRIBUTE-PROVIDER.rst which could be a good place to add the information of this PR, WDYT? My concern is that it is a big change and it may take time to be merged.

[potiuk]

I think yours will be faster, so we might ask @paolaperaza to incorporate that one after she rebases ? WDYT @paolaperaza ?

[paolaperaza]

@marcosmarxm Excited to see this! I just commented in #14176, but I agree with @potiuk - let's get this merged first and I'll incorporate changes into my PR from there.

[github-actions]

The Workflow run is cancelling this PR. It has some failed jobs matching ^Pylint$,^Static checks,^Build docs$,^Spell check docs$,^Provider packages,^Checks: Helm tests$,^Test OpenAPI*.

[potiuk]

@marcosmarxm Excited to see this! I just commented in #14176, but I agree with @potiuk - let's get this merged first and I'll incorporate changes into my PR from there.

Merged!

[kaxil]

Thanks @marcosmarxm this looks really good 👏

[potiuk]

It does indeed :)!

[potiuk]

I will cherry-pick those to 2.0.2 as well so that it gets into 'stable' docs