Assign the `id` and pass the `event` into the Picker's `onChange`

Hello,
I am using `SketchPicker` inside a component that is used several times and that in the various uses I differentiate through `id`.

The problem is that I can't assign the `id` and pass the `event` in the Picker's `onChange`... what can I do?

Furthermore, is it possible not to have inline css but to have it in a dedicated style sheet?

Thankss

Start by reviewing the SketchPicker onChange entry point and how its inline styles are exposed. Determine the expected API for assigning an id, forwarding an event, and supporting a dedicated stylesheet; done means these use cases are documented and verified without breaking existing picker behavior.

Written by the indexing model from the issue text.