Commit List SHA Offset/Pagination

Description

Currently you can paginate with offset query parameter but this doesn't stand the test of time(not a permalink) and isn't that useful for finding where a commit lands in the overall list.

https://gitlab.com/gitlab-org/gitlab-ce/commits/master?offset=1000

Proposal

Make the offset query parameter(or new parameter) accept a commit sha.

https://gitlab.com/gitlab-org/gitlab-ce/commits/master?offset=78874519db2ca2f18a2fbca5fe070292e521d0c1

Would be neat to accept the git revision selection syntax with relative sha~X

Semantic web 🎉

Links / references

• See here for the current offset implemenation which uses gitlabhq/gitlabhq -> Repository.find_commits_by_message
• Slightly related to https://gitlab.com/gitlab-org/gitlab-ce/issues/20323