[native] Phase out ColorPicker and replace with ColorSelector

Summary:
Related Linear issue with full context here.

This diff removes ColorPicker from native (gone but not forgotten) and replaces it with ColorSelector. Along with renaming all instances of ColorPicker this also refactors ColorPickerModal to use ColorSelector as the ColorSelectorModal.

Test Plan: Tested the mobile app to make sure the ColorSelector worked and looked as expected. Devices tested: iPhone SE, iPhone 13 Pro, iPhone 13 Pro Max, iPhone 12 Pro, Pixel 4, Nexus 5.

Reviewers: atul, palys-swm

Reviewed By: atul, palys-swm

Subscribers: ashoat, Adrian

Differential Revision: https://phab.comm.dev/D4418