Add buf plugin registry commit commands

[emcfarlane]

This adds buf registry plugin commit {add-label,info,list,resolve} commands to manage BSR plugin commits.

The trimmed output of buf plugin registry commit --help:

Manage a plugin's commits

Usage:
  buf registry plugin commit [flags]
  buf registry plugin commit [command]

Available Commands:
  add-label   Add labels to a commit
  info        Get commit information
  list        List plugins commits
  resolve     Resolve commit from a reference

[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	Dec 3, 2024, 9:20 PM