Coding: Parallelize mapping aggregation results

[callahantiff]

Needed Scripts: Improve the aggregates_mapping_results() in the data_utils.py script

Task: Currently, the function that aggregates and compiles the mapping results generated from running the omop2obo exact match and similarity mapping scripts is slow. An easy first step to improve performance

Changes Needed By (date/time): Make changes for release V3.0