Add verifiers.mcp Submodule to support mcp agents

[vyomakesh0728]

Description

Moves the MCP protocol/environment support files (MCPServerConnection, MCPToolWrapper, MCPServerConfig) from environments/mcp_env/src/ to a new, dedicated submodule: verifiers/mcp/.

This change does not modify any underlying logic or implementation—just code location for package structure and developer convenience to implement seamlessly for mcp agents from the sheet.

Type of Change

• 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 not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

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