Bring from EE: Share Project with Group

Dmytro Zaporozhets (DZ)requested to merge
share-project-ce into master
  • Models and migrations
  • Logic, UI
  • Tests
  • Documentation
  • Share with group lock
  • Api feature
  • Api docs
  • Api tests

Signed-off-by: Dmitriy Zaporozhets dmitriy.zaporozhets@gmail.com

For #12831 (closed)

cc @DouweM @rspeicher @vsizov

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