feat: AI Research

[AyushAgrawal-A2]

closes #2068

https://ayush-ai-researcher.quadratic-preview.com/

• Enable disable "AI Researcher (exa subprocessor) in settings @jimniels
• Prompt logging
• AI Formulas vs UI? It should act like a formula when it's a formula, and a Research cell when it's a researcher cell.
• UI: styles for "Settings" form controls @jimniels
• UI: async loading indicators when prompt is sent (happening now in the sheet, but not in the code editor like JS/Python)
• UI: better error messages
• UI: remove "Fix in AI" button?

[qa-wolf]

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[codecov]

Codecov Report

Attention: Patch coverage is 94.07666% with 68 lines in your changes missing coverage. Please review.

Project coverage is 89.64%. Comparing base (671775c) to head (a642391).

Files with missing lines	Patch %	Lines
...controller/execution/run_code/run_ai_researcher.rs	94.57%	48 Missing ⚠️
quadratic-core/src/a1/js_selection/query.rs	0.00%	7 Missing ⚠️
...adratic-core/src/grid/file/serialize/cell_value.rs	41.66%	7 Missing ⚠️
quadratic-core/src/grid/js_types.rs	90.00%	2 Missing ⚠️
...re/src/controller/execution/control_transaction.rs	93.75%	1 Missing ⚠️
...atic-core/src/controller/execution/run_code/mod.rs	50.00%	1 Missing ⚠️
...dratic-core/src/controller/operations/clipboard.rs	98.94%	1 Missing ⚠️
quadratic-core/src/grid/file/v1_7_1/upgrade.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           data-tables-v1    #1963      +/-   ##
==================================================
+ Coverage           89.56%   89.64%   +0.08%     
==================================================
  Files                 388      390       +2     
  Lines               75222    76297    +1075     
==================================================
+ Hits                67373    68398    +1025     
- Misses               7849     7899      +50     

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[jimniels]

Two comments here on an experience I had (locally):

1. THere's no error message (I had didn't have an API token, so that's why it wasn't working, but seems like we should have a generic error message like "Something went wrong. Try again or contact support"
2. Should we have a "Fix in AI" button? There's not "AI Assistant" tab for this, do we really want an AI helping write/fix prompts that go to AI?