Run all Congreses; update only new bills and save new-to-old and old-to-new similarity

[aih]

Current

Similarity calculations are run through this function:

https://github.com/arachnidllc/BillMap/blob/main/server_py/flatgov/uscongress/tasks.py#L79

This is currently hard-coded to run only the most recent Congress:
https://github.com/arachnidllc/BillMap/blob/main/server_py/flatgov/uscongress/tasks.py#L183

This runs the esquery command from Go, which is defined here:
https://github.com/aih/bills/blob/main/cmd/esquery/main.go

Saving data is done here:
https://github.com/aih/bills/blob/main/cmd/esquery/main.go#L76

It is saved to files here:
https://github.com/aih/bills/blob/main/billstoreutils.go#L92

After all bill similarity json files are saved, the data is saved to database by processing the similarity json files:
updateBillModelFields
https://github.com/arachnidllc/BillMap/blob/main/server_py/flatgov/uscongress/tasks.py#L192

https://github.com/arachnidllc/BillMap/blob/main/server_py/flatgov/common/billdata.py#L504

Future

We need to:

1. Initialize the processing with all congresses
2. Update with only recent bills or the latest congress
3. When the bill-to-bill similarity is saved, we need to save the old-to-new and new-to-old similarity