RFR: 8346129: Simplify EdDSA & XDH curve name usage

[Anthony Scarpino]

Hi,

I need a review for the following change. Naming conventions for EdDSA and XDH have inconsistencies between DisabledAlgorithms and KeyPairGenerator. These internal changes help make it more consistent when parsing the actual curve being used vs the broader algorithm name.

thanks

Tony

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Commit messages:
 - spacing
 - immutable
 - Merge branch 'ef' into xdhed
 - comments
 - cleanup
 - more cleanup
 - cleanup, both tests still pass
 - passing two tests
 - cleanup

Changes: https://git.openjdk.org/jdk/pull/23647/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23647&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346129
  Stats: 242 lines in 5 files changed: 218 ins; 3 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/23647.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23647/head:pull/23647

PR: https://git.openjdk.org/jdk/pull/23647