<i18n dev> RFR: 8337279: Optimize format instant [v7]

[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 nine additional commits since the last revision:

 - 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
 - optimize format instant

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20353/files
  - new: https://git.openjdk.org/jdk/pull/20353/files/ccbd6b5a..df2a13d4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20353&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20353&range=05-06

  Stats: 40550 lines in 1327 files changed: 22559 ins; 11677 del; 6314 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