<i18n dev> RFR: 8337279: Optimize format instant [v9]

[Shaojin Wen]

> By removing the redundant code logic in DateTimeFormatterBuilder$InstantPrinterParser#formatTo, the codeSize can be reduced and the performance can be improved.

Shaojin Wen has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 11 additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into optim_instant_fmt_202407
 - suggestion from @jensli
 - Speed up Instant.toString using JavaTimeAccess
 - add JavaTimeAccess SharedSecrets
 - Merge remote-tracking branch 'upstream/master' into optim_instant_fmt_202407
 - breaking out the printNano methods
 - copyright
 - Update src/java.base/share/classes/java/time/format/DateTimeFormatterBuilder.java
   
   Co-authored-by: Stephen Colebourne <scolebourne at joda.org>
 - 1. fix handle fraction == -1
   2. Split two methods to make codeSize less than 325
 - add comment
 - ... and 1 more: https://git.openjdk.org/jdk/compare/32c9de0b...1c2482e7

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20353/files
  - new: https://git.openjdk.org/jdk/pull/20353/files/2342276e..1c2482e7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20353&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20353&range=07-08

  Stats: 179340 lines in 1462 files changed: 162395 ins; 8883 del; 8062 mod
  Patch: https://git.openjdk.org/jdk/pull/20353.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20353/head:pull/20353

PR: https://git.openjdk.org/jdk/pull/20353