[FEATURE] - add endpoint to return summary of business data

[navarroc]

Is your feature request related to a problem? Please describe.
We don't have an endpoint to return the summary of business data, which is what the crop insurance data is based on. The crop insurance data is a "summary" of the summary of business data.

Describe the solution you'd like
We need to add an endpoint to return the summary of business data, along with filters to get subsets of it or aggregate it to what we use in the crop insurance page. This needs to be either queried from the database.

Describe alternatives you've considered
To begin, the data could come from JSON/CSV files on the service, but I believe the data should fit well in a database structure.

Additional context
None