A logger api with some convenience stuff for better logging.

• Include current log line in every log (i.e the line of the log call).
• Clean up stack traces, such as skip logger.dart entries.
• Optionally include some specified metadata with every log.
• Easily direct logs to local/remote logger.
• Some convenience stuff when logging from a google cloud run server.
• logger.eApi() which logs with error-level or info-level depending on if the device currently has internet access.