Mirror Media Folders with S3

[takayumi]

Currently, if you want to make your Payload collections mirror your S3 bucket, you will need to create collections one by one and set an explicit prefix for them in the S3 storage like this:

collections: {
      media: {
        prefix: 'media',
      },
      documents: {
        prefix: 'documents',
      },
    },

It would be nice if the S3 adapters can expose a HandleRead to let us hook into the S3 adapter to update the prefixes based on the folder structure.

This is so that we can easily browse our own Payload folders and have a similar experience when browsing with other S3 browsers.

Relevant Discussions/Issues: #1961 #4190