Vaccine-feed-ingest-schema

Release new providers with brands from kroger, albertson's and others

Minimum Python version dropped from 3.9 to 3.8. 32

Add optional `content_hash` str field to `ImportSourceLocation`.

This field is used to round-trip an MD5 hash of the content of the `import_json` (sorted keys without the `source` field) to check if the source location has changed or not.

Release more `VaccineProvider` enum values:

1. `LITTLE_CLINIC`
1. `MARIANOS`
1. `MARKET_STREET`
1. `MEDICAP`
1. `MEIJER`
1. `OSCO`
1. `PICK_N_SAVE`
1. `PRICE_CHOPPER`
1. `PUBLIX`
1. `QFC`
1. `RALEYS`
1. `SAV_ON`
1. `SHOP_RITE`
1. `SMITHS`
1. `SOUTH_EASTERN`
1. `STOP_AND_SHOP`
1. `THRIFTY`
1. `TOM_THUMB`
1. `WEIS`
1. `WINN_DIXIE`

* Add enum values for 30 providers to `VaccineProvider`

- Place length limits on string fields:
- Note fields are limited to 2046 characters.
- Enum fields are limited to 64 characters.
- ID fields are limited to 128 characters.
- All other fields are limited to 256 characters.
- The phone number validation has been relaxed to accept any 9-digit-style phone numbers.