RFR: 8189441: Define algorithm names for keys derived from KeyAgreement [v3]

[Weijun Wang]

> Allow `Generic` as an algorithm in the `KeyAgreement::generateSecret(alg)` method.

Weijun Wang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into 8189441
 - spec on secret key algorithms
 - add key size adjustment clarification
 - the fix

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22650/files
  - new: https://git.openjdk.org/jdk/pull/22650/files/3d62a503..2d78955e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22650&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22650&range=01-02

  Stats: 35247 lines in 3270 files changed: 22967 ins; 5328 del; 6952 mod
  Patch: https://git.openjdk.org/jdk/pull/22650.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22650/head:pull/22650

PR: https://git.openjdk.org/jdk/pull/22650