Add db update calls

[dankelleher]

For simplicity, and to avoid dependencies, we are taking advantage of Mongo's HTTP API to update the DB.

This API update is currently not in place in the existing code.

To post a transfer (a mint in this case) to the DB:

curl --request POST \
  --url https://data.mongodb-api.com/app/data-vhksk/endpoint/data/v1/action/insertOne \
  --header 'Content-Type: application/json' \
  --header 'api-key: XXX' \
  --data '{
      "dataSource": "Cluster0",
      "database": "gsol-tracker",
      "collection": "mints2",
      "document": {
        "timestamp": { "$date": {"$numberLong": "1675768427000" }},
        "recipient": "48V9nmW9awiR9BmihdGhUL3ZpYJ8MCgGeUoSWbtqjicv",
                "amount": 1000000000
      }
  }'

Transfers are identical, but the collection is "transfers2" and there is an additional sender field

and to get the data (use this for testing and debugging):

curl --request POST \
  --url https://data.mongodb-api.com/app/data-vhksk/endpoint/data/v1/action/find \
  --header 'Content-Type: application/json' \
  --header 'api-key: XXX' \
  --data '{
    "dataSource": "Cluster0",
    "database": "gsol-tracker",
    "collection": "transfers2",
    "filter": {
        "$or": [
            {
                "recipient": "48V9nmW9awiR9BmihdGhUL3ZpYJ8MCgGeUoSWbtqjicv"
            },
            {
                "sender": "48V9nmW9awiR9BmihdGhUL3ZpYJ8MCgGeUoSWbtqjicv"
            }
        ]
    }
}'