RFR: JDK-8301998: Update HarfBuzz to 7.0.1

Fri Mar 3 19:45:55 UTC 2023

HarfBuzz library updated from v4.4.1 to v7.0.1

- harfbuzz.md file updated
- Added -DHB_NO_VISIBILITY to HARFBUZZ_CFLAGS in Awt2DLibraries.gmk to avoid build issues on linux and macos targets.
- GPOS.hh has been moved from Layout to Layout/GPOS to match upstream changes.
- Total of 270 files changed out of which 46 are newly added.

-------------

Commit messages:
 - harfbuzz.md updated
 - newly added files & folders
 - harfbuzz updated files

Changes: https://git.openjdk.org/jdk/pull/12864/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12864&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301998
  Stats: 40669 lines in 271 files changed: 26593 ins; 8274 del; 5802 mod
  Patch: https://git.openjdk.org/jdk/pull/12864.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12864/head:pull/12864

PR: https://git.openjdk.org/jdk/pull/12864