[FA-2] Adding login func to mcp server

[scott-clare1]

This PR adds two MCP endpoints for the server:

1. A login endpoint accepting an API key
2. An endpoint for retrieving account information.

A demo for interacting with server with Claude Desktop:

Screen.Recording.2025-04-01.at.10.04.54.mov

Checklist

Please ensure you have done the following:

• I have read the CONTRIBUTING guide.
• I have updated the documentation if required.
• I have added tests which cover my changes.

Type of change

Tick all those that apply:

• Bug Fix (non-breaking change, fixing an issue)
• New feature (non-breaking change to add functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

MacOS tests

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Our advice is to only run this workflow when testing the compatability between operating systems for a change that you've made, e.g., adding a new dependency to the virtual environment.

Note: This can take up to 5 minutes to run. This workflow costs x10 more than a Linux-based workflow, use at discretion.

[samgwd]

LGTM