RFR: 8298127: HSS/LMS Signature Verification

[Ferenc Rakoczi]

Implement support for Leighton-Micali Signatures (LMS) as described in RFC 8554. LMS is an approved software signing algorithm for CNSA 2.0, with SHA-256/192 parameters recommended.

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Commit messages:
 - LMS and HSS classes

Changes: https://git.openjdk.org/jdk/pull/13691/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13691&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298127
  Stats: 889 lines in 7 files changed: 886 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/13691.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13691/head:pull/13691

PR: https://git.openjdk.org/jdk/pull/13691