[BIFROST]: Enable Taproot Observations

Context

TC does not support taproot, but it now can !3669 (merged)

Observations

https://gitlab.com/thorchain/thornode/-/blob/develop/common/address.go?ref_type=heads#L54

Calls this:

func DecodeAddress(addr string, defaultNet *chaincfg.Params) (Address, error)

https://github.com/guggero/btcutil/blob/c5b2b0b97977fdeadbd9374410432351b39b5e00/address.go#L148C6-L148C61

which calls this

case 32:
        if witnessVer == 1 {
      return newAddressTaproot(hrp, witnessProg)
    }

https://github.com/guggero/btcutil/blob/c5b2b0b97977fdeadbd9374410432351b39b5e00/address.go#L176C4-L179C6

Signing

Allow spending to TR https://gitlab.com/thorchain/thornode/-/blob/develop/bifrost/pkg/chainclients/utxo/signer.go?ref_type=heads#L95

References

Taproot MR on BTCSuite: https://github.com/btcsuite/btcutil/pull/205

https://pkg.go.dev/github.com/btcsuite/btcd/txscript#PayToAddrScript