HWI
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Implement PSBTv2
BIP 370 specifies a version 2 for PSBT that HWI should support.
Given that the PR for adding the BIP hasn't been merged into the bips repo yet, and that there are no test vectors, we should implement this for a future release when those (and hopefully Core support) are done.
This won't be an API breaking change since all we need is to support deserializing PSBTv2s and reflect them back to the user when given. Since HWI doesn't produce PSBTs itself, there won't be anything that breaks the API.
Done in #549