[bisq-network/bisq] Tidy PersistableEnvelope inheritance (#4102)

[Manfred Karrer]

@ManfredKarrer approved this pull request.

utACK

I recommend to test a few cycles in regtest where the changed classes are used to see if it does not break consensus. Also maybe better to merge it after the next release so we get more time for dev testing to detect potential issues. I dont see any but the DAO consensus is tricky. 



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