Add BIP66

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This commit adds a `chain-hash` field to message that commences a
funding workflow. This field is used to specify a _target_ chain for the
proposed channel. In order to uniquely identity blockchains in a manner
that doesn't require strict coordination between developers, the genesis
hash of the target chain is used. For channels opened on the Bitcoin
blockchain, the `chain-hash` field should _always_ be set to:
000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f.

Introducing this new field _immediately_ allows nodes within the network
to open a channel within any Satoshi-derived blockchain. Nodes can have
channels open across different blockchains globally, but also have many
channels open across distinct blockchains with the same peer.

ADD: Require BIPs for Taproot and Tapscript