[jdk21u-dev] RFR: 8325766: Extend CertificateBuilder to create trust and end entity certificates programmatically

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

Resolved imports and added further ones.

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Commit messages:
 - backport 31847149c1956b23c19a99309982660b4bbdd2d6

Changes: https://git.openjdk.org/jdk21u-dev/pull/2377/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2377&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325766
  Stats: 769 lines in 2 files changed: 161 ins; 563 del; 45 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2377.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2377/head:pull/2377

PR: https://git.openjdk.org/jdk21u-dev/pull/2377