This change adds the following to the list branches api:
- 'query' parameter for querying branches using arbitrary substrings
- 'sort' parameter for sorting the branches (name and date supported)
- 'direction' parameter for specifing the direction of the sorted output
To simplify UI code we are going to expose both Harness API and Standalone API (restricted to harness embedded functionalities) when running in harness mode.
Furthermore, this PR adds a middleware that allows us to reuse standalone Handlers for Harness API for operations that don't require any request/response manipulation.
