Add script to generate received payment report csv

[kristapsk]

Creates simple CSV report with actually paid invoices.

Also, thinking about potential use cases of SatSale, I would suggest adding two additional fields to the payments table in db. First, fiat currency in addition to fiat value, as it can be changed in config after first payment is done and also possibily multiple fiat currency selection could be added in future. Second, if weak hands mode is enabled, saving USDT value received might be useful for tax reporting purposes. In a lot of counries, income tax you need to pay depends on a fiat value you receive, so it changes whether you do BTC->L-USDT exchange at the moment of payment or you exchange BTC for fiat at some point in time later.

[nickfarrow]

Just getting around to this, I'll have a play around with it

[kristapsk]

Rebased

[nickfarrow]

Ran it on my instance that actually has a couple payments, worked great! Ready to merge

Thoughts on starting a /scripts directory? Perhaps first of many? I could potentially put the paynym one in there too, makes more sense than /gateways.

[kristapsk]

Thoughts on starting a /scripts directory?

I think that's good idea! Too much potentially random scripts in a root directory is not a good idea. Should I update PR?

[nickfarrow]

yes please, thanks again

[kristapsk]

Done

[kristapsk]

Ehhh, and nobody re-tested it after moving to different directory. :(

$ python3.9 ./scripts/generate_payment_report.py 
Traceback (most recent call last):
  File "/home/satsale/git/SatSale/./scripts/generate_payment_report.py", line 5, in <module>
    import config
ModuleNotFoundError: No module named 'config'