Bug fixes for 421, parsing of gemini

2.2.7.P1

Policy:

• Added flow diagram
• add response code to log

Proxy:

• Bug fixes for logging to Type: S7P-ProxyRequest
• Bug fixes for parsing gemini-2.5-pro
• Logging changes to differentiate startup from runtime
• Refactor and move config out of backends and into cofig directory
• Refactor request cleanup into RequestData class and proxyworker for readability
• Fix status code updates for background jobs
• Bug fix for 421 that was not ending up in S7P-ProxyRequest logs

Test:

• added test cases for gemini-2.5, gemini-2.5-pro, gemini-2.5-pro-streaming
• Refactor to make it easier to add test cases

RequestAPI:

• removed New, NewBulk, Update

Docs:

• Updated policy docs link

What's Changed

• Feature/eventgrid by @nagendramishr in #95

Full Changelog: v2.2.7...v2.2.7.P1-2