Extensive improvements

What's Changed

• Asynchronous operation for vastly higher throughput; parallelizes processing across and within files by @emeryberger
• Improved validity checking by @emeryberger in #6
• Change to handle nested functions. by @emeryberger in #7
• LiteLLM and Bedrock support by @emeryberger in #9

Full Changelog: v0.0.3...v0.2.9