Upstream PR:
"Implement crdtp::ErrorSupport, replacing the jinja2 template."
https://chromium-review.googlesource.com/c/deps/inspector_protocol/+/2036608

In addition; this PR includes removal of now unused routines
in string-util.h (StringBuilder and number conversions).

New Rev: e4ffb7288a17b2bbe2f7b7cd62abcb1d1e55681a

Change-Id: Iae14c001c1f468466a42cb1b842c0ded766fccc9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2037959Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66165}