[bisq-network/bisq] Add transient tx map to DaoState to speed up getTx queries (#3773)

[Steven Barclay]

I've applied the suggested patch as a third commit, minus a few of the non-mutating accessors added to `Block` and `DaoState` (as I think that makes it slightly simpler and should have negligible impact on performance). I also swapped the merge function arguments and used `putIfAbsent` in place of `txCache.put(..)` for greater consistency with the original behaviour, as commented above.

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