Get configuration fields required for a specific connector with type information.

Args: connector_name: Name of the connector to get config map for

Returns: Dictionary mapping field names to their type information. Each field contains: - type: The expected data type (e.g., "str", "SecretStr", "int") - required: Whether the field is required - allowed_values: List of accepted values (only for Literal fields) - prompt: Human readable prompt from the Hummingbot config map (when defined)