v2.6.1 - Faster Importing

Significantly improve cyclopts import speed by lazy loading dependencies.

What's Changed

• defer asyncio and importlib import by @OrHayat in #154
• defer optional pydantic import, speeding up initial import by @BrianPugh in #155
• defer rich import. Also defer difflib by @BrianPugh in #156

Full Changelog: v2.6.0...v2.6.1