Add TLVs required for splicing taproot channels#1324
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Nice to have this follow up!
When sending `tx_add_input`, we previously required transmitting the entire transaction being spent to prevent malleability issues where attackers replace a `p2wpkh` input by a `p2pkh` input after signing. When both participants of the interactive-tx protocol sign a taproot input, this malleability issue disappears. We thus allow transmitting only the utxo amount and script in that case. For simplicity, we only allow this when splicing a taproot channels (where both participants sign the previous funding output) or when *all* inputs are using taproot (we could be less strict, but being too smart here may risk losing funds, so we err on the cautious side).
We add musig2 nonce fields in various `interactive-tx` messages to allow using taproot channels with dual funding and splicing.
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We add support for splicing and dual-funding taproot channels. Each commit adds a specific feature that leverages taproot and splicing:
prevtxfield when using taproot: there are caveats because of malleability issues (see https://delvingbitcoin.org/t/malleability-issues-when-creating-shared-transactions-with-segwit-v0/497 for more details)