Ruby driver has 3 listCollections-related helpers:

• collections
• list_collections
• collections_names

As a follow-up to https://jira.mongodb.org/browse/RUBY-2142, we should make it possible to pass all server-supported options to all of these helpers. This would entail:

 Changing all 3 methods to take options = {} as the argument.
Changing the methods to forward options ultimately to the listCollections command.
 Adding the authorized_collections => authorizedCollections mapping.
Verify that name_only option also works in list_collections, if so add it to the docstring & add a test.
Updating docstrings on all methods to add all known options.

Note that all of our helpers filter out system collections. Once authorized_collections is added as an argument, this filtering could potentially be removed to allow applications to discover system collections, though this would be a behavior change and potentially would need Mongoid work ahead of time to use the authorized_collections option.