Add server config for GCP Spanner and CloudSQL

[kankaiz]

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Google just announced a few GCP database support as per here

They are all remote servers.

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MCP Server Information

Server Name: GCP Spanner
Repository URL: https://spanner.googleapis.com/mcp
Brief Description: official doc

Server Name: GCP CloudSQL
Repository URL: https://sqladmin.googleapis.com/mcp
Brief Description: official doc

Basic Requirements

• Open Source: Uses acceptable license (Apache-2.0, MIT, BSD-2-Clause, BSD-3-Clause or other permissive license)
• MCP Compliant: Implements MCP API specification
• Active Development: Recent commits and maintained
• Documentation: Basic README and setup instructions
• Security Contact: Method for reporting security issues

Submitter Checklist

• This server meets the basic requirements listed above
• I understand this will undergo automated and manual review.
• I have tested the MCP Server using task validate -- --name SERVER_NAME
• I have built the MCP Server using task build -- --tools SERVER_NAME
• If the server requires credentials to test it, I have shared test credentials using this form