This upgrades bitcoin to 0.32 and related dependencies accordingly.
Note that the bdk_electrum crate has not been upgraded to the most
recent version available as the Electrum syncing there takes much
longer due to the fetching and validation of Merkle proofs. There
are ongoing BDK changes in relation to that and so we can further
upgrade this dependency once those changes have been completed.
Non-BDK changes to the liana and lianad crates are taken from
darosior's commit 20ee8b1e7b77cbf65942bc4f083afea95f2d1506 in
draft PR https://github.com/wizardsardine/liana/pull/1228.
This integrates fuzzing into our project by introducing two targets
which exercise the descriptor parsing and analysis logic.
The `descriptor_parse` is dead simple but not very effective. The
`descriptors` harness tries to be smarter by almost always generating a
valid Liana descriptor.
Of course, this is just a first integration and both could be made more
effective.
