feat(angular-mcp-server): add listing tool, extend listing api

[Karnaukhov-kh]

🔧 Add list-ds-components tool and enhance get-ds-component-data with selective data retrieval

This PR introduces a new MCP tool for component discovery and enhances an existing tool with performance optimizations.

🆕 New Tool: list-ds-components

• Lists all available Design System components in the project
• Returns component names, folder structures, import paths, and file metadata
• Supports selective data retrieval via sections parameter (implementation, documentation, stories, all)
• Enables component discovery workflows before targeted analysis

🔧 Enhanced Tool: get-ds-component-data

• Added optional sections parameter for selective data retrieval
• Improves performance by fetching only requested data types
• Maintains backward compatibility (defaults to ["all"])
• Reduces payload size for focused component analysis