RFR: 8364182: Add jcmd VM.properties command [v3]

[Kieran Farrell]

> The goal of this PR is to add a means of exposing security properties at runtime to aid the debugging security related issues/misconfigurations etc. Currently, only initial security properties set at start up can be exposed via the `InitialSecurityProperty` JFR event. 
> 
> This patch introduces a new jcmd diagnostic command `VM.properties`, which enables developers to print either the current system properties or security properties of a running Java process via command-line arguments (-system or -security). To avoid clutter within the jcmd command list, the old `VM.system_properties` command is hidden, but not removed so will not break existing usages. The implementation of each is shared to reduce duplication.

Kieran Farrell has updated the pull request incrementally with one additional commit since the last revision:

  rm unused code

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/29124/files
  - new: https://git.openjdk.org/jdk/pull/29124/files/232feeaa..81655c07

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29124&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29124&range=01-02

  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29124.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29124/head:pull/29124

PR: https://git.openjdk.org/jdk/pull/29124