Enhancements to Shaka Error Handling

[William-Paradis]

📖 Description

This PR originates from the mirego/video-shaka-js fork, and we believe it could be a valuable addition to the official library.

This PR introduces a mapper to transform Shaka errors into a more organized format for New Relic.

👷 Work Done

• Attached the error EventListener to the player instead of its tag. This change seemed necessary to obtain the detail of the error. It is also the method described in the Shaka documentation: https://shaka-player-demo.appspot.com/docs/api/tutorial-errors.html
• Introduced a mapper to transform Shaka errors into a more organized format for New Relic, aiming to align as closely as possible with their Data dictionary.
  • Changed message to errorMessage
  • Changed code to errorCode
  • etc.
• Added tests for the features introduced .

🗒 Notes

I've also noticed that the -p flag used by Webpack for building the library is no longer supported, so I've updated package.json to utilize the new --mode flag.

[CLAassistant]

All committers have signed the CLA.