Adding JAT profiling results on OpenX datasets

[pranavguru]

Profiling results of JAT inference on OpenX datasets until now:

• jat_openx_evaluation_results_test.json : OpenX datasets that have test splits
• jat_openx_evaluation_results_val.json: OpenX datasets that don't have test splits, but have val splits
• jat_openx_evaluation_results_train2eval.json: OpenX datasets that don't have both test and val splits, so 20% of their train split is used for eval