Add the Model Context Protocol integration

[allenporter]

Proposed change

Add the Model Context Protocol integration, which is a client.

See https://modelcontextprotocol.io/introduction#general-architecture for background on how MCP works. This integration is the opposite of #134122 and acts as a client.

The initial integration adds support for LLM tools only (does not yet include prompts or resources, where we don't actually have a way to support them generally). This registers a new LLM API that exposes tools returned by the remote MCP server. The LLM API can be consumed by another conversation agent integration.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue:
• This PR is related to issue:
• Link to documentation pull request: Add Model Context Protocol integration documentation. home-assistant.io#36799

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

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