Add owner attribute to BranchInfo

[EyalDelarea]

• [x] All tests passed. If this feature is not already covered by the tests, I added new tests.
• [x] I used go fmt ./... for formatting the code before submitting the pull request.
• [x] This feature is included on all supported VCS providers - GitHub, Bitbucket cloud, Bitbucket server, and GitLab.

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Add owner attribute to branch info, when getting pull request info it is important to know both of the owners, as they can differ when the pull request is from a forked repository.

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