RFR: 8318026: jcmd should provide access to detailed JVM object information [v10]

[Kevin Walls]

> Introduce the jcmd "VM.inspect" to implement access to detailed JVM object information.
> 
> Not recommended for live production use.  Requires UnlockDiagnosticVMOptions and not included in jcmd help output, to remind us this is not a general-purpose customer-facing tool.

Kevin Walls has updated the pull request incrementally with two additional commits since the last revision:

 - Argument to be named address.
 - test nit

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17655/files
  - new: https://git.openjdk.org/jdk/pull/17655/files/bf5e4b26..837154c1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17655&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17655&range=08-09

  Stats: 28 lines in 3 files changed: 6 ins; 3 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/17655.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17655/head:pull/17655

PR: https://git.openjdk.org/jdk/pull/17655