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

[Steven Barclay]

stejbac commented on this pull request.



> @@ -145,6 +154,10 @@ private DaoState(int chainHeight,
         this.paramChangeList = paramChangeList;
         this.evaluatedProposalList = evaluatedProposalList;
         this.decryptedBallotsWithMeritsList = decryptedBallotsWithMeritsList;
+
+        txMap = blocks.stream()
+                .flatMap(block -> block.getTxs().stream())
+                .collect(Collectors.toMap(Tx::getId, Function.identity(), (x, y) -> y, HashMap::new));

I wanted to guarantee that the output is a HashMap and it looks like the only `toMap` overload with a mapFactory param also has a mergeFunction param, so I was forced to provide a dummy merge function.

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