taproot::new

[supreme2580]

• [ ] issue #
• [ ] follows contribution guide
• [ ] code change includes tests

• parse_schnorr_pub_key: Had already been implemented

• TaprootSigVerifierImpl::new: uses the reference from btcd https://github.com/btcsuite/btcd/blob/24eb815168f49dea84767817717a11bd7928eb23/txscript/sigvalidate.go#L313

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