Cherry-pick pull/1152to fix minimum group digits

Needed to fix Minimum Grouping Digits for Intl.RelativeTimeFormat
Add ability to use locale default for minimum grouping digits
 - patches/grouping_digits.patch
 - upstream PR:
   https://github.com/unicode-org/icu/pull/1152
 - upbstream bug:
   https://unicode-org.atlassian.net/browse/ICU-21109

Bug: v8:10443
Change-Id: I5f9f627d8be5cca42d842a4bef4661b29efd060f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/2242106
Reviewed-by: Jungshik Shin <jshin@chromium.org>
5 files changed