This pull request targets issue #6573.
It provides a new API endpoint: `/api/v1/repos/{org}/{repo}/commits?pageSize=<int>` with a default page size of 30 commits (the same as the UI).
This implementation currently only focuses on the main/master branch of the repository, and does not provide the ability to return commit history for other branches.
- Note: Since the logic for converting a git.Commit to api.Commit had to be used in `GetAllCommits` and `GetSingleCommit`, I decided to pull the code out into a helper function, ` gitCommitToAPICommit(commit, context)`.
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