Add refund reports

[NicolasDorier]

Refund reports.

I didn't see @Kukks has been working on it, possible alternative to #5783

Reviewed Kukks's one, outside a minor point (not using the display formatter), it's also good, no strong preferences.

Still need tests

[pavlenex]

Unlike #5783, this one actually worked for me in dev enviroment.

@NicolasDorier Thoughts on giving crypto amount rate and currency? IMO these should reflect the typical payment report just do it for refunds and provide as much info as possible, you never know what people actually need from them.

Can you explain what fully paid status is? Is it full CryptoAmount or just complete refund or something else?

[NicolasDorier]

@pavlenex Fully Paid is saying if all the money has been transferred from the pull payment of the refund.
We don't keep information on which way the user decided to reimburse. We only know he did a refund of X amount in X currency, which is all that is shown here.

That said, for BTCPay 2.0, we can start saving additional information for future refunds.

[NicolasDorier]

This is now ready and tested. I changed the name of the columns to reflect what is used in the pull payments page.

[pavlenex]

Looks good to me, but I have't tested in-depth.