[bisq-network/bisq] Adopt fee model to de-incentivize offers with huge market price distance (#4630)

[m52go]

I've been seeing this uptick in offers, but I figured the offer makers would naturally take down their offers / adjust premiums downward when they realized no one was taking them. But I also wasn't fully aware of the cost to the network.

There is a [blog post](https://bisq.network/blog/trading-trends-august-2020/) from a short while ago that covers premiums paid in major markets. The highest that _average_ premiums reach is 7-8%, but most are much lower.

I would have analyzed time to take offer as well, but couldn't because the data in trade statistics doesn't seem reliable.

Another option could be to give offer-markers 2 simple options: short-lived offers and long-lived offers. Short-lived offers cost X and last for some short period of time, while long-lived offers cost Y and last for some longer period of time (maybe forever?)...where Y is considerably higher than X. This might naturally encourage the whole market to make offers that are taken quicker without punishing anyone. Ideally this measure would only be activated for active markets.

Framing it as a cost to cover a _service_ offered over time, instead of a cost based on a trader's specific behavior, is important I think.

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