8 plugin api

[MatInGit]

Added a plugin API and refactored the plugins to use click rathrer than argparse at the top level, this lets us add subcommands rin run plugin etc. that make it clearer as to what we are doing.

Because the plugin API uses entrypoints I had a chance to clean it up a bit and loading times have greatly imrpoved.

[Copilot]

Pull Request Overview

This PR adds a comprehensive plugin API to the poly-lithic framework and refactors the CLI to use click instead of argparse. It introduces dynamic plugin discovery through entry points, improves loading times, and adds a subcommand structure with run and plugin commands for better usability.

Key changes:

• Added plugin API with dynamic loading via entry points
• Refactored CLI from argparse to click with subcommands
• Added plugin project generator with Jinja2 templates
• Updated module registries to use standard dictionaries instead of lazy loaders

Reviewed Changes

Copilot reviewed 24 out of 26 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
poly_lithic/src/utils/plugin_registry.py	Core plugin registry system enabling dynamic plugin discovery and loading
poly_lithic/src/cli.py	Complete CLI refactor from argparse to click with subcommands and better UX
poly_lithic/src/utils/plugin_generator.py	Plugin project generator using Jinja2 templates
poly_lithic/templates/plugin/*.j2	Template files for generating plugin projects
poly_lithic/src/transformers/__init__.py	Simplified from lazy loader to direct dictionary-based registry
poly_lithic/src/interfaces/__init__.py	Simplified from lazy loader to direct dictionary-based registry
poly_lithic/src/model_utils/__init__.py	Simplified from lazy loader to direct dictionary-based registry
tests/test_plugin_registry.py	Comprehensive test suite for plugin registry functionality
pyproject.toml	Updated dependencies and entry points for new CLI structure

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