[Feature Request] Add YAML support for MCP client config files

Popular MCP clients like [LibreChat](https://www.librechat.ai/docs/features/agents#model-context-protocol-mcp) and [goose](https://block.github.io/goose/docs/getting-started/using-extensions/#config-entry) use YAML for managing their MCP server configuration (note: in the case of goose, it also uses the system keychain to store the value of the env vars as secrets).

It would be great if a command like `mcp configs alias goose ~/.config/goose/config.yaml` could be used. Currently it only supports JSON format with `JSONPath`.