[bisq-network/bisq] Add feature to cancel a trade (#4340)

[James Cox]

To summarize the work on this so far has been largely driven by the comments above.

1. initial implementation was to use the mediation framework, enhancing it to include indication that the user requested a cancel and suggesting the distribution of his deposit as shown.  This would have involved the mediator.
2. second implementation was to try and automate the cancel so that if the cancelee agreed it would payout accordingly.  This was using mediation messaging but not involving the mediator GUI.
3. third implementation was to start from scratch, making the cancel request/response an integral part of the trading protocol.  User A would request to cancel, knowing that they will forfeit part of their security deposit.  User B would receive an popup requesting he accept or decline the cancel.  If he declined then it would fallback to opening a mediator ticket.


**tldr;**  Gut feel after having used the workflow is that upon seeing the penalty amounts, most users would not want to go ahead with it.  So I can agree somewhat with Wiz' comment above that mediation works better.


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