Append middleware to the chain.

Default configures a standard lambda handler with default middleware which includes the zerolog and raw logging.

Fields pass a map of attributes which are appended to all log messages and raw events.

GenericDefault configures a generic standard lambda handler with default middleware which includes the zerolog and raw logging.

LogLevel minimum accepted level for logging.

Output is a writer where logs in JSON format are written.

RawEnabled is a flag to toggle this middleware on or off.