Move registry commit and label commands under modules

[emcfarlane]

This moves the buf registry commit and buf registry label commands under buf registry module as buf registry module commit and buf registry module label respectively. The commands buf registry commit and buf registry label are marked as deprecated as well as all of their subcommands.

The help-tree for buf registry module --help-tree:

module         Manage BSR modules
  commit       Manage a module's commits
    add-label  Add labels to a commit
    info       Get commit information
    list       List modules commits
    resolve    Resolve commit from a reference
  create       Create a BSR module
  delete       Delete a BSR module
  deprecate    Deprecate a BSR module
  info         Get a BSR module
  label        Manage a module's labels
    archive    Archive a module label
    info       Show label information
    list       List module labels
    unarchive  Unarchive a module label
  undeprecate  Undeprecate a BSR module
  update       Update BSR module settings

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Nov 13, 2024, 4:57 PM

[emcfarlane]

Uses the lowercase to allow building the string message with ,:

$ buf mod
Command "mod" is deprecated, all commands are deprecated and have moved to the "buf config", "buf dep", or "buf registry" subcommands.
...

The short message above was altered to match althought it's never displayed as Hidden: true is set.

[doriable]

This looks good to me, and it's nice to clean-up the message casing.