Allow publish of a individual sub-modules at different versions

[aiuto]

In several repositories we are splitting into multiple modules with completely decoupled release versioning.

• fundamental constants and providers into a distinct module what will rev only occasionally. It may be at version 1.x forever
• tools and contrib which may update every month. version 2.x of those may still depend on older ones

So we need a bcr workflow that takes a module and version string as input. Alternate is to think of the tag as package-version, but then we need a way to map back from canonical name of the packge to the submodule folder it is in, so easier to just take the module path as input.