[native][refactor] sort colors in theme

Summary: sort colors in theme. I think long term we should think about using a theme lib that has a bit more flexibility than what we have now. Just for dx at the moment, sorting these values makes finding them a little easier.

Test Plan:
in vscode run command + shift + p search for sort lines asc. result should be the same.

Reviewers: atul, palys-swm, def-au1t, yayabosh

Reviewed By: atul

Subscribers: ashoat, Adrian, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D3935