<i18n dev> RFR: 8362448: Make use of the Double.toString(double) algorithm in java.text.DecimalFormat

[Raffaello Giulietti]

Align the behavior of `DecimalFormat` on `double`s with that of `Formatter`.

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Commit messages:
 - Merge branch 'master' into 8362448
 - 8362448: Make use of the Double.toString(double) algorithm in java.text.DecimalFormat
 - Remove some unused methods from FloatingDecimal.
 - Renamed compatibility config option.
 - Merge branch 'master' into dtoa
 - Remove unused methods.
 - Merge branch 'master' into dtoa
 - Added logic for exactness and direction of rounding.

Changes: https://git.openjdk.org/jdk/pull/26364/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26364&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362448
  Stats: 98 lines in 6 files changed: 47 ins; 7 del; 44 mod
  Patch: https://git.openjdk.org/jdk/pull/26364.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26364/head:pull/26364

PR: https://git.openjdk.org/jdk/pull/26364