[backend] adding tools for agents, filter tools by agent_id

[scott-cohere]

Eventually we would want to map tools to a DB table. However, for v1 we can just store tools as a list of tool names as users cannot actually delete,add,update tools in the application itself (must be done in the code). For v1 we also do not have the notion of different organizations yet.

Also adding query param on GET /v1/tools -> GET /v1/tools?agent_id=... to filter tool by agent id

• Add tests and docs: Please include testing and documentation for your changes
• Lint and test: Run make lint and make run-tests

AI Description

This PR introduces a new tools field to the Agent model, allowing for a list of associated tools. This change is reflected in the database schema, test suites, and API endpoints.

• The Agent model in src/backend/database_models/agent.py now includes a tools field, which is a list of ToolName enums.
• The upgrade and downgrade functions in src/backend/alembic/versions/922e874930bf_.py have been updated to add and remove the tools column from the agents table, respectively.
• The create_agent function in src/backend/routers/agent.py now includes the tools parameter, which is passed to the create_agent function in the agent_crud module.
• The list_tools API endpoint in src/backend/routers/tool.py has been modified to accept an optional agent_id parameter. It now returns a list of tools associated with the specified agent, if provided.
• The Agent class in src/backend/schemas/agent.py now includes a tools field, which is a list of ToolName.
• The test_create_agent and test_update_agent functions in src/backend/tests/crud/test_agent.py have been updated to include the tools field in the agent creation and update requests.
• The Agent factory in src/backend/tests/factories/agent.py now includes a tools field, which is a list of random ToolName enums.
• The test_create_agent function in src/backend/tests/routers/test_agent.py has been updated to include the tools field in the agent creation request.
• The test_list_tools function in src/backend/tests/routers/test_tool.py has been modified to test the listing of tools associated with a specific agent.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.59155% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@5155eee). Learn more about missing BASE report.

Files	Patch %	Lines
src/backend/alembic/versions/922e874930bf_.py	91.66%	1 Missing ⚠️

Additional details and impacted files

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[lusmoura]

LGTM!