Add HSA support to GeoMapper

[melange396]

This is motivated by the desire to more properly capture the NSSP dataset, which appears to report county-level information, but it is actually reporting HSA-level information (and repeating the same value for each county in an HSA).

• We have some HSA info in the GeoMapper resource files:
  • https://github.com/cmu-delphi/covidcast-indicators/blob/main/_delphi_utils_python/delphi_utils/data/2019/zip_hsa_table.csv
  • https://github.com/cmu-delphi/covidcast-indicators/blob/main/_delphi_utils_python/delphi_utils/data/2020/zip_hsa_table.csv
  • (both files were created by our custom geo data processing code)
• However, these files are not currently used in the GeoMapper itself.
• Further complicating this process, the NSSP dataset actually uses "NCI Modified" HSA definitions as described at https://seer.cancer.gov/seerstat/variables/countyattribs/hsa.html .
  • We may want to consider adding this as a different and separate geographic region type, like "hsa_nci" or "nci".
  • As an example of the difference between these "versions" of HSA:
    • Beaver and Allegheny counties in Pennsylvania are reported in the NSSP dataset with the same hca_nci_id of 42.
    • Ambridge in Beaver county uses the ZIP code 15003, which shows in our mapping file as the "proper" HSA 39111 (not "42"!)
    • CMU in Allegheny county has ZIP 15213, which shows as a different "proper" HSA 39098 (also not "42")