[jdk17u-dev] RFR: 8286925: Move JSON parser used in JFR tests to test library

[Goetz Lindenmaier]

I backport this to simplify later backports that require this file.

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Commit messages:
 - Backport ac7e019232903db38a03f644c3d31c858cbf3967

Changes: https://git.openjdk.org/jdk17u-dev/pull/3575/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3575&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286925
  Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3575.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3575/head:pull/3575

PR: https://git.openjdk.org/jdk17u-dev/pull/3575