DB changes, added indexes, number of contracts for searched naics, FAPIIS replacement

This PR includes several sweeping DB changes and should be pulled in conjunction with the sql dump I shared in google drive. 

- Removed all FAPIIS remnants
- Added reason_for_modification column that has the status code, including terminated contracts
- Added number of contracts per searched NAICS to API
- Added view cache to vendors endpoint
- Added DB index as a migration to speed up naics queries