#15 Implement Kong Plugins Management Tools #15

[Mohamad-Bahmani]

add plugin management tools with filtering and pagination

• Implement kong_get_plugins for retrieving all plugins with optional name filtering
• Implement kong_get_plugins_by_service for service-scoped plugin listing
• Implement kong_get_plugins_by_route for route-scoped plugin listing
• Implement kong_get_plugins_by_consumer for consumer-scoped plugin listing
• Support pagination parameters (offset, size) for large plugin lists
• Create new module kong_mcp_server.tools.kong_plugins
• Add tool configurations to tools_config.json with descriptions
• Write unit tests with full function coverage
• Write integration tests with full code coverage using real Kong Admin API