Expose total amount in USD per month for Node Operator payouts

[iglesiasbrandon]

When I want to the trend for Storage Node Operator payouts in the Storj Network I want to know the total amount paid out per month so that I can use that data to create line graphs and understand Storage Node operator payouts better.

[grafael]

What about a new endpoint with the following structure:

file: satellite_payments.json

{
"[email protected]:7777": {
    "2021-07": 100,
    "2021-06": 90,
    "2021-05": 90,
    "2021-04": 80,
    "2021-03": 70,
    "2021-02": 60,
},
"[email protected]:7777": {
    "2021-07": 100,
    "2021-06": 90,
    "2021-05": 90,
    "2021-04": 80,
    "2021-03": 70,
    "2021-02": 60,
}
}