[bisq-network/bisq] Speed up "Synchronizing DAO" by ~30% (#5484)

[cd2357]

Done, thanks for the speedy review.

> There is missing the chache update when a new block is added in `onNewBlockWithEmptyTxs`.
> Maybe its better to create explicit methods for `daoState.getBlocks().addAll` and `daoState.getBlocks().add` in DaoStateService.

Good point. I restricted the adding of blocks to two new methods, `addBlock` and `addBlocks`. They make sure to update all the indices as well. Also made sure the `DaoState.blocks` list is not exposed directly anymore, but as an unmodifiable list, so no direct modifications are possible.

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