Auto detect log format, support ElasticSearch spans

Added

• Add a log format option for autodetection the log format.
• Add support for native OpenTelemetry spans from @elastic/transport package in Node.js.

Changed

• Detect the log format automatically. We now detect if a log line is in the JSON, Logfmt, or plaintext format. No further config needed when calling our logger, like so:

  JavaScript

  const logger = Appsignal.logger("app");
  logger.info("message");

Fixed

• Fix 'unknown' events being reported for some HTTP routes.

View the Node.js package v3.7.2 changelog for more information.