Update gnomAD colab (#681)
Update gnomAD colab (#681)

This change includes:
* Update run_query() to show more details
* Introduce variant_type_col to make queries compatible with v2 and v3
* Introduce extra_columns (for vep columns) to make queries compatible with v2 and v3
* Modify all queries to make their output similar to VCF columns
googlegenomics/gcp-variant-transforms,googlegenomics/gcp-variant-transforms