Add performance measurements tests for schema validation

:Release Notes:
Added tests to measure performance of schema validation

:Detailed Notes:

:Testing Performed:
Unit tests passed

:QA Notes:

:Issues Addressed:
[GF-38338] pbnjson: Measure and tune schema validation performance

Open-webOS-DCO-1.0-Signed-off-by: Mykola Kryvonos <mykola.kryvonos@lge.com>

Change-Id: I81d214ed6afb8afd97ffa5354451cb6aac2fadce
Reviewed-on: https://g2g.palm.com/3418
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Tested-by: Keith Derrick <keith.derrick@lge.com>