Labels management for Projects

[acuanico-tr-galt]

Solution description

• The labels management feature for TestRail projects addresses the need for better organization and categorization of test management assets by implementing a complete CRUD (Create, Read, Update, Delete) interface through the TestRail CLI. Implemented as a new labels command group with intuitive subcommands (add, list, get, update, delete) that follow established CLI patterns and conventions.

Changes

• Added complete labels command group with 5 subcommands
• Added parameter validation (title length ≤20 chars, valid integer IDs)
• Added confirmation prompts for delete operations
• Added comprehensive error handling and user feedback
• Added nested API response parsing for robust data extraction

Potential impacts

None

Steps to test

Please see updated README document and look for Labels Management section.

PR Tasks

• README updated
• Unit tests added/updated

[acuanico-tr-galt]

Thanks @unroma for the initiative to do review! We are still testing this one and your insights are helpful. We are looking into them :)