Feature - Command line interface for OpenRegistry management & maintenance

[jay-dee7]

Is your feature request related to a problem? Please describe

OpenRegistry works with multiple storage provides, very often, we have to run OCI conformance tests, perform database migrations, and many other such operations. We only have a single yaml based configuration which is quite difficult to understand & becoming quite complex.
We should:

1. Make the OpenRegistry config as optional as possible
2. Add options to provide config via cli flags
3. Add Daemon mode like cloudflared (control a systemd config)
4. Configure Log format, verbosity, level, output, etc via the cli

Describe the solution you'd like

The solution is quite simple, the current main.go file becomes an entry point for our CLI and the existing functionality moves to cmd/<command>.go like cmd/openregistry.go.
We must add the following commands:

1. openregistry start (with optional flags like --config-file, --log-format, --daemon, etc)
2. openregistry migrations (all of the critical subcommands should have --dry-run flag if possible)
3. run - Run the migrations
4. generate - Automated generation of migration files
5. rollback - Rollback the latest migration run

Describe alternatives you've considered**

nil

Additional context

nil