RFR: 8337517: Redacted Heap Dumps

[Henry Lin]

Adds a command line option `-redact` to `jcmd`, `redact` to `jmap` and `-XX:+HeapDumpRedacted` enabling redacted heap dumps. When enabled, the output binary heap dump has zeroes written out in place of the original primitive values in the object fields. There is a new jtreg test `heapDumpRedactedTest.java` that tests that the fields are properly redacted.

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Commit messages:
 - remove whitespace
 - fix array redact and format
 - add jmap redact
 - changed heapDumper.cpp dump function to take in redact
 - add redact option to jcmd line
 - formatting
 - redacted heap dump and test

Changes: https://git.openjdk.org/jdk/pull/20409/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20409&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337517
  Stats: 287 lines in 13 files changed: 176 ins; 12 del; 99 mod
  Patch: https://git.openjdk.org/jdk/pull/20409.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20409/head:pull/20409

PR: https://git.openjdk.org/jdk/pull/20409