Provide helper methods for custom handling of the `Media.upload` steps

[Micka33]

Context

Currently, the Media.upload method handles all the upload steps synchronously and one chunk after another. If a chunk fails to be uploaded, the whole process fails.

There are cases where the developer might want to proceed differently, especially when the media is large, eg:

• To parallelize chunk uploads.
• To set custom retry logic when chunk upload fails.
• To use a queue to asynchronously upload each chunk of a media.

We need to expose the methods to allow these use cases.

Todo

• Figure out which methods need to be exposed and created
• Implement / Expose required methods in Media class
• Update IMedia accordingly
• Use available Query and Response types
• Update unit tests
• Update integration tests
• Update Readme
  • Add example of parallelized uploads
  • Update Table of contents