Add basic structure for GDrive OAuth tool

[BeatrixCohere]

Add basic structure for GDrive OAuth tool

Doesn't include:

• More error handling
• Testing
• storing (user_id,tool_id) in state
• correct UI flow

AI Description

Summary

This PR adds a new tool to the backend, Google Drive, and its associated authentication. It also updates the tool authentication system to include tool-based authentication.

Changes

• Added a new tool, Google Drive, which searches Google Drive for relevant files.
• Added tool-based authentication, which is currently experimental and in development.
• Added a new table, tool_auth, to store access tokens for tools that require authentication.
• Added a new column, is_auth_required, to the ManagedTool model to indicate whether a tool requires authentication.
• Added a new column, auth_url, to the ManagedTool model to store the authentication URL for a tool.
• Updated the list_tools function to include the is_auth_required and auth_url fields for each tool.
• Added a new abstract base class, BaseAuth, for tool authentication.
• Added new functions, get_auth_url, is_auth_required, and process_auth_token, to the BaseAuth class for tool authentication.
• Added a new class, GoogleDriveAuth, which inherits from BaseAuth and implements authentication for the Google Drive tool.

[lusmoura]

LGTM!

[lusmoura]

Any chance we can check if the user is authenticated here?

[BeatrixCohere]

We could but I think it is better to have the error in is_auth_required?

[giannis2two]

Should we add a tool_id property in BaseTool for all tools to share?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.21637% with 80 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@0bf8b73). Learn more about missing BASE report.

Files	Patch %	Lines
src/backend/tools/google_drive.py	35.80%	52 Missing ⚠️
src/backend/crud/tool_auth.py	31.57%	13 Missing ⚠️
src/backend/routers/auth.py	35.29%	11 Missing ⚠️
src/backend/alembic/versions/a6efd9f047b4_.py	84.61%	2 Missing ⚠️
src/backend/routers/tool.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
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  Coverage        ?   85.65%           
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  Files           ?      153           
  Lines           ?     5716           
  Branches        ?        0           
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  Hits            ?     4896           
  Misses          ?      820           
  Partials        ?        0           

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[BeatrixCohere]

tool_id

Agreed, won't do here but will follow up with it