Add org.eclipse.jgit.pgm.feature to enable consumption via p2

Orion wants to consume the pgm bundle from a p2 repository in their
build. Also add corresponding source bundle and feature to provision
sources via a target platform.

Bug: 373789
Change-Id: I0016ee155553c546606b63d310666eb10bd997e1
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
30 files changed