Camera app: Use TypeScript Mojo bindings

Since camera app code is in TypeScript, also use TypeScript for the
generated mojo bindings.

This also allows some simplification of the build setup (for example,
mojo files can be passed to ts_library() directly, and do not require
a separate grdp file).

Added cca.py updates (and other changes) from
https://chromium-review.googlesource.com/c/chromium/src/+/4305582/1
by pihsun@ in PS 4 --> 5 diff.

Bug: 1002798
Change-Id: I61ef118866f50beb7f9f1dac3475a2313f20cdfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4304482
Reviewed-by: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Xinglong Luan <alanlxl@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Reviewed-by: Josh Horwich <jhorwich@chromium.org>
Reviewed-by: Andrew Moylan <amoylan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1114338}