Add FitBit MCP Server

[NitayRabi]

Description

Add an MCP server that connects to FitBit API.

Motivation and Context

Adds a new MCP Server link

How Has This Been Tested?

Currently ran it locally with an LLM client.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

[NitayRabi]

@olaservo - Anything I can do to push this to review?

[evalstate]

@NitayRabi can you update this so it's in alphabetical order please.