Parse JSON Processor: README, more testing, support for JSON Pointer

[finnroblin]

Signed-off-by: Finn Roblin [email protected]

Description

Adds documentation and support for JSON Pointers to the parse_json processor

Issues Resolved

Resolves #831

Check List

• [X] New functionality includes testing.
• [X] New functionality has been documented.
  • [X] New functionality has javadoc added
• [X] Commits are signed with a real name per the DCO

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