Merge with --admin `shift+m` / `M`

Is your feature request related to a problem? Please describe.

There are a few PR's that us as admins submit ourselves and don't require approval. Right now the merge: m command will not succeed as we need to bypass the approvals gate. The means I have to open the PR in Github to bypass the merge approval.

Describe the solution you'd like Add an option with merge (admin bypass): M / Shift+m that runs gh pr merge --admin https://cli.github.com/manual/gh_pr_merge