[bisq-network/bisq] Add hash of dao state (#2532)

[sqrrm]

sqrrm commented on this pull request.

My comment on throwing an exception only happened midway through these commits. I still think it can happen but couldn't recreate it.

Everything looks good while running on the current tip. I think it's basically good to go.

> +
+    public void createHashFromBlock(Block block) {
+        updateHashChain(block);
+    }
+
+    public void requestHashesFromGenesisBlockHeight(String peersAddress) {
+        daoStateNetworkService.requestHashes(genesisTxInfo.getGenesisBlockHeight(), peersAddress);
+    }
+
+    public void applySnapshot(LinkedList<DaoStateHash> persistedDaoStateHashChain) {
+        // We could got a reset from a reorg, so we clear all and start over from the genesis block.
+        daoStateHashChain.clear();
+        daoStateBlockchain.clear();
+        daoStateNetworkService.reset();
+
+        log.info("Apply snapshot: Last daoStateHash={}", persistedDaoStateHashChain.getLast());

This throws an exception for an empty persistedDaoStateHashChain.

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