Cleanup code related to bucket storage

[edclement]

The code for this project was originally base on: https://github.com/verdaccio/monorepo/tree/v10.0.6/plugins/google-cloud. All of the code within data-storage.ts has been refactored and optimized, with good code readability and good code comments. This file deals with everything except bucket storage interaction.

The storage.ts file needs the same level of cleanup as it is lacking good/clear code readability, good logging, and any informative code comments.