feat: support auth block in MCP servers config in agents

[TanmayVartak]

This PR adds support for the 'auth' block in the 'mcp_servers' section of agent markdown files, allowing local agents to configure Google credentials or OAuth for MCP servers.

[gemini-code-assist]

Summary of Changes

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This pull request introduces authentication capabilities for MCP servers defined in local agent markdown files. By adding an 'auth' block, users can now configure Google credentials or OAuth settings directly within their agent definitions, enabling secure access to MCP servers that require authentication.

Highlights

• Authentication Support: Added support for an 'auth' block within the 'mcp_servers' configuration in agent markdown files.
• Configuration Schema: Updated Zod schemas to validate 'google-credentials' and 'oauth' authentication types for MCP servers.
• Agent Loader Logic: Updated the agent loader to map the new authentication configuration to the internal MCPServerConfig structure.

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[gemini-code-assist]

Code Review

This pull request introduces support for authentication configurations in MCP servers within agent definitions. It updates the mcpServerSchema to include google-credentials and oauth authentication types and modifies the markdownToAgentDefinition function to correctly map these configurations to MCPServerConfig. Additionally, a new test case was added to verify the conversion of MCP servers with Google credentials. I have no feedback to provide.