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

[m-roberts]

Popular MCP clients like LibreChat and goose 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.