Make provider releases "officiallly" versioned by date #47343
Description
Currently we treat .sdist packages of providers as "source" packages released by the ASF.
The small problem with it that so far they did not contain "tests" or "docs" - and generally it was not possible to run tests and build docs separately.
With recent refactorings however, where each provider is a separate Python project, we should be able to easily build a source package that will be standalone and it will allow to build sources and run tests easily.
UPDATE: rather than having separate "per provider" sources we should do sources for snapshot of all of them - tagged and named with "date" of provider releases (optionally followed by sequential number). That would be way, way easier and more accurate (we will avoid cross-provider dependencies problems) - and way easier to implement. It will also allow running several independent releases of providers running in parallel.