Adds the following:
- Add GetContent API (with gitrpc, proto, gitadapter changes)
- Add ListCommits API (with gitrpc, proto, gitadapter changes)
- DefaultBranch (to repo table in DB, update branch in git-repo, have default value in config)
* initial work on create repository
* create repository as single method call using client stream
* resources handler and files
* minor fix for wire dep graph
Preparing the support for harness specific API router + http handler, which allows us to have complete control over the rest api naming and functionality, without having to do complex path rewrites or request / reponse rewrites inline.
