feature: provide a way to pass options to `axe.configure`

[fivetanley]

As mentioned in #285, axe.run and axe.configure have different options. It's necessary to support both axe.run (which is already supported via setRunOptions), and axe.configure, which would allow for custom checks/rules and more flexibility when configuring things.

[MelSumner]

API docs: https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#api-name-axeconfigure