1. Normalizer: Use ICU's normalizer2 API instead of deprecated
normalizer. Also uses quick scan method in the API to speed up in the
most common cases (almost normalized and the target is NFC)

2. In all three cases,  replace |v8::Utils::ToLocal(..)| with a more
efficient internal method.

BUG=v8:4983
TEST=intl/string/normal*, intl/collator/*, intl/break-iterator/*
TEST=test262/intl402/Collator/*, test262/built-ins/String/prototype/normalize/*
CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_noi18n_rel_ng

Review-Url: https://codereview.chromium.org/1971943002
Cr-Commit-Position: refs/heads/master@{#36298}