Provider error proxy for simulating various types of errors

[katzdave]

Still in flight as I encounter issues + test more providers but already starting to be useful in uncovering some issues of errors we handle poorly.

Providers to test:

• [x] Openai
• [x] Anthropic
• [x] Google
• [x] Databricks
• [ ] Openrouter
• [ ] Tetrate

[michaelneale]

great idea - I think anthropic is really needed as it seems to have the most issues (and is one of the more popular 1st party ones).

[DOsinga]

have a look at what copilot said and let's merge this?