Default branch file and directory locks API endpoint

Problem to solve

The existing Default branch file and directory locks is only available via the application GUI, making it hard to automate this step as part of a release process.

Further info

Currently, users can register a file type as lockable with LFS and use a remote server that implements LFS file locking API. Both of these options should be available in GitLab.

Proposal

In the larger effort to extend file locking options, we should implement an API endpoint for each lock operations. This particular one would the existing functionality offered in-app.

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