Migrate impc_etl/jobs/load/impc_web_api/impc_phenotype_statistical_results_mapper.py to use Airflow

[ficolo]

• The input asset matches the output of the required DAG
• The output assets match the output path of the luigi task
• The DAG runs locally
• Documentation in place

Dependencies:

• StatsResultsMapper (stats_results_parquet)
• GeneLoader (gene_parquet)

Input Parquet Files:

• stats_results_parquet
• gene_parquet

Output:

• phenotype_stats_service_parquet