Feature/shorthand aliases

[FilleTP]

Implements shorthand aliases for topic branch actions as described

Key Changes:

• Added shorthands: delete, rebase (stub), update, rename, publish (stub), finish.
• Detection logic for topic branches (feature, release, hotfix, support) with prefix matching from config.
• Error handling: Clear message if not on valid topic, prompt for ambiguity.
• Options passthrough to underlying commands.
• Comprehensive tests for all cases (basic, parsing, options, errors, specific commands, config, exit codes).

Stubs: Rebase and publish are stubbed with "not implemented" errors, as underlying RebaseCommand/PublishCommand don't exist in the codebase yet.

Resolves #2

• Tested shorthand commands manually in test repo
• Formatted changed files with gofmt