feat: add tesseract command

[br-monteiro]

This pull request introduces a new tesseract command to the CLI tool, enabling users to fetch and display product variation data from the Tesseract API for different business units. It includes full implementation, documentation, and comprehensive unit tests. The command supports filtering by blocked status, quiet output mode, and configuration via both config file and environment variables.

The most important changes are:

New Command Implementation:

• Added the tesseract command with arguments for business unit and model, supporting options for filtering by blocked status and quiet output. The command fetches data from the Tesseract API and displays it in a table format. (commands/tesseract/tesseract_command.py)
• Implemented the TesseractAPI class to handle API requests, business unit URL selection, and configuration validation. (commands/tesseract/tesseract_api.py)
• Registered the new command in the package init. (commands/tesseract/__init__.py)

Documentation:

• Added a detailed README for the tesseract command, covering configuration, usage, options, and output format. (commands/tesseract/README.md)
• Updated the main README.md to document the new tesseract command in the command table.

Testing:

• Added comprehensive unit tests for the TesseractAPI class, covering configuration validation, URL selection, API request behavior, and error handling. (tests/commands/tesseract/test_tesseract_api.py)