facility fix and new endpoint

[dfarrow0]

• bool('false') is True
• add a helper function to parse bool from str, allowing missing and
  empty values

note that prod database needs to be backfilled since previous
acquisitions incorrectly casted 'false' and 'true' both to True

---

• the hhs covid hosp dataset is keyed by hospital_pk, which is a
  unique identifier for healthcare facilities.
• the key is not generally well-known, but querying the
  covid_hosp_facility dataset requires key(s)
• the new endpoint returns facility information (including key) for
  given regions (e.g. city, state, zip, ccn, fips)
• users would be expected to lookup hospitals of interest e.g. by state
  or city. then query covid_hosp_facility with the key for those
  hospitals.
• server and clients updated
• all unit and integrations pass

note that new indexes are added to the database to facilitate fast
lookups. otherwise it would be a full table scan each time, which does
not scale well. indexes are expected to be very small.

[chinandrew]

[chinandrew]

does a list of states work here or do they have to be individual?

[dfarrow0]

here they would be individual states. i'm not opposed to making that a list of states if it's useful, but prefer to defer that as a followup

[chinandrew]

here they would be individual states. i'm not opposed to making that a list of states if it's useful, but prefer to defer that as a followup

makes sense, sounds fine to leave as is