Returns the Schnorr signature for `message`. The message will be signed with the private key derived from `key_name`, `derivation_path`, and the optional [BIP341](https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki) `merkle_root_hash`.
(
key_name: String,
derivation_path: Vec<Vec<u8>>,
merkle_root_hash: Option<Vec<u8>>,
message: Vec<u8>,
)
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no outgoing calls
no test coverage detected