Fix Native AOT list argument serialization

[kondv]

Summary

• Register source-generated JSON metadata for the List<object> argument shape used by McpClientTool
• Extend the Native AOT compatibility app to invoke a discovered array-parameter tool with populated and empty lists

Fixes #1846

Testing

• Release build: 0 warnings and 0 errors
• Full non-manual suite: 11,042 passed, 382 skipped, 0 failed
• Repository Native AOT compatibility executable: Success!
• Fresh external consumer using only locally packed MCP packages: managed execution Consumer Success!
• The same package consumer published as Native AOT: Consumer Success!