[native] Introduce ColorSelectorButton component

Summary:
First step in redesigning the ColorPicker component on native to match the ColorSelector component on web introduced by @atul.

ColorSelectorButton is a new component that will work with ColorSelector to replace ColorPicker on native.

See the full plan for the ColorPicker redesign in this Linear issue.

Test Plan:
Tested on iOS 15.4 and works as expected:

Reviewers: atul

Reviewed By: atul

Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga, benschac, atul

Differential Revision: https://phabricator.ashoat.com/D3790