Support hr-BA for number formatting.

Test in https://chromium-review.googlesource.com/c/v8/v8/+/1573038

Bug: v8:8604

Change-Id: I139442a7eb85ee1c141c1678270a6334783096fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/1570225
Reviewed-by: Jungshik Shin <jshin@chromium.org>
16 files changed