Allow dicts and lists in rule options

It would be great if you could use a dict or even lists in rule options.

Let's say I want to enforce aliased imports for specific modules inside my codebase.
I would create a `AliasedImportRule` rule.

If I have multiple aliases I want to enforce, I need multiple rule instances.
It would be easier if I could just pass a mapping of aliases to my rule, especially if I want to distribute that rule in a package for other people to use.