Support mechanism to select a specific version of module sdk prebuilt

This CL is the java_(test_)_import equivalent of aosp/2928483.

With trunk stable, we will have
multiple prebuilts of the prebuilt java .jars in
prebuilts/module_sdk/art/<v>/test-exports/, and this CL introduces a
mechanism to use apex_contributions to select a specific versioned
prebuilt when building.

Implementation details: Create a new source_module_name property to
identify the root module. rdeps referring to the root module will get
redirected if necessary. This property also
becomes the stem, if `stem` is not set explicitly.

Bug: 322175508

Test: Added a unit test
Change-Id: I2dff38acdf2002355586dbb2be8c1f98af4741f7