[GM3] Moving Panorama color picker to cr_component

The start of the html and css was copied over in
https://chromium-review.googlesource.com/c/chromium/src/+/4652259.
This is largely a moving over (with a little copying) of code to make
the theme color selector from the Customize Chrome side panel reusable
in Settings. There is also cleanup so that CustomizeChromePageHandler
doesn't have unused methods and mojom data after the removal. Notable
changes or things I felt might need explaining in the cleanup have a
comment on them to help make this easier to navigate.

In this CL:
* Anything needed from CustomizeChromePageHandler and the associated
  mojom file were moved over to ThemeColorPickerHandler. The only color
  related code that there is still a copy of in
  CustomizeChromePageHandler is foreground and background colors in the
  Theme object and 2 methods for resetting to Classic Chrome.
* Colors.html, colors.ts, color.html, color.ts were all copy pasted over
  with just a changing of names and then deleted. This is also on top of
  renaming them from their name from the first CL. Check_mark_wrapper.ts
  and check_mark_wrapper.html were also copied over for use. A copy was
  left behind for use by other Customize Chrome Side Panel elements.
* ChromeColorsElement was left where it is since it has no plans to be
  reused and might end up being removed entirely. However, it is now
  connected to the new handler so it can still use all of the methods it
  depended on.
* Unit tests and browser tests were also moved/copied over as needed.
  Browser tests should all be moved other than the check_mark_wrapper,
  which is a copy. Unit tests are a mix to match the movement done in
  the page handlers themselves.
* The rest of it is bindings, inserting it into the side panel, OWNERS,
  and BUILD related changes.

customize_chrome_colors.cc. It didn't have tests before and it doesn't
make sense for it to have tests. It build an array on build time for use
in other files.

Low-Coverage-Reason: The only low coverage file is
Bug: 1459420
Change-Id: Ic1111f388452d833ad4e63dc6ee52543064daf13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4676662
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: Riley Tatum <rtatum@google.com>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1175721}