RFR: 8313205: Modernize java.text.Format with StringBuilder [v3]

[Justin Lu]

> Please review this PR which adds public StringBuilder overloads to the formatting methods of java.text.Format and implementing subclasses.
> 
> While Format, NumberFormat, and DateFormat are abstract, these new methods are not added as abstract to prevent compatibility concerns. Instead they are added as non-abstract methods, with a default implementation that throws UOE and a recommendation that subclasses override and provide their own implementations. These new methods use the same specification as the StringBuffer ones, with exception of `MessageFormat.format(format(Object[] arguments, StringBuilder result, FieldPosition pos)` which omits the table, and instead links to it.
> 
> The JDK implementing Format classes, (such as DecimalFormat) leverage the StringBuf proxy methods.
> 
> A corresponding CSR has been drafted: https://bugs.openjdk.org/browse/JDK-8337141, which goes into detail on motivation/history. (Holding off on uploading the specification to CSR until wording finalized).

Justin Lu 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 four additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into JDK-8313205-Format-publicStrBldr-overloads
 - throw UOE where possible in abstract class level
 - add since tags
 - init

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20337/files
  - new: https://git.openjdk.org/jdk/pull/20337/files/314b8d7b..0e4a70c8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20337&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20337&range=01-02

  Stats: 40405 lines in 1259 files changed: 21540 ins; 13082 del; 5783 mod
  Patch: https://git.openjdk.org/jdk/pull/20337.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20337/head:pull/20337

PR: https://git.openjdk.org/jdk/pull/20337