[jdk17u-dev] RFR: 8244670: convert clhsdb "whatis" command from javascript to java

[Victor Rudometov]

Backport  [JDK-8244670](https://bugs.openjdk.org/browse/JDK-8244670) convert clhsdb "whatis" command from javascript to java

Clean backport, 
Parity with 17.0.6-oracle
Tested: tier1, tier2, jck's.

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Commit messages:
 - Backport 00c0d1087021603f3f09131cb0458ac8b9c110e5

Changes: https://git.openjdk.org/jdk17u-dev/pull/849/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=849&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8244670
  Stats: 22 lines in 3 files changed: 21 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/849.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/849/head:pull/849

PR: https://git.openjdk.org/jdk17u-dev/pull/849