RFR: 8366364: Address inconsistencies in SSLParameters object returned by SSLConfiguration#getSSLParameters() call

[Artur Barashev]

We need to address the following inconsistencies in SSLConfiguration#getSSLParameters() call:
- For the signatureSchemes we return only what's been set by the user, the default values are not being returned like for other SSLParameters.
- namedGroups return value is not being filtered against algorithm constraints, unlike other SSLParameters.

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Commit messages:
 - 8366364: Address inconsistencies in SSLParameters object returned by SSLConfiguration#getSSLParameters() call

Changes: https://git.openjdk.org/jdk/pull/27961/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27961&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366364
  Stats: 108 lines in 10 files changed: 47 ins; 35 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/27961.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27961/head:pull/27961

PR: https://git.openjdk.org/jdk/pull/27961