Add config for including and excluding buckets

[ellisonbg]

It would be helpful to limit which buckets a particular users sees in the file browser. They may have access permissions to a larger set of buckets, but only which to work with a smaller number. Having an include_buckets and exclude_buckets config would enable users or admins to pick which buckets are included or excluded from the top level bucket list.

[DenisaCG]

Thanks for opening this issue!

The linked PR has added support for including and excluding specific buckets.