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

[Steven Barclay]

I've amended the original commit in accordance with some of the suggestions above. A sanity check has been added to `DaoStateService.onNewBlockWithEmptyTxs` that the last block is the same as that passed in. The `DaoState.txMap` initialisation logic has been moved from `toProtoMessage` to the private constructor, simplifying that class slightly.

I've also added another commit to replace all but one use of `DaoStateService.getTxStream` with the unordered `txMap` values, as suggested above.

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