Initial JSON Parser implementation (#65) * Initial JSON Parser implementation (80% done) * Uses JSON parser if file has json extension * test and docs * doc fixes * Linter problems fixed * Updated font * Added testcases for the :ref:`json_parser` and updated docs. * Updated `parse_testsuite()` and `parse_testcase()` to read dict-keys from `tr_json_mapping` config value. * Bugfix and complex json test --------- Co-authored-by: Duodu Randy <[email protected]>