feat(IPVC-2478): updates/fixes to UTA files found during testing

[bsgiles73]

During the final build and testing of the UTA data release several issues were found and fixed...

1. Update methods that write out txinfo to add in the new codon_table column (misc/refseq-historical-backfill/ncbi_extract_gbff.py & sbin/ncbi-parse-gbff).
2. Fix uic config to point at Invitae internal server
3. Add misc/export_mappings.py to repo. Used to compare content from new version to the last.
4. Remove schema version and set role command from misc/generate_alingment_metrics.py.
5. Update data name in sbin/update_ncbi script.
6. Add tx_def_summary_v to initial alembic script.
7. Add hgnc to the tx_similarity_v view.
8. Add tx_exon_aln_mv to the refresh_matviews command.

[nvta1209]

Should the description be updated for this script?

[bsgiles73]

Yes, they should!