Function build_transaction

Builds a P2TR transaction to send the given `amount` of satoshis to the destination address.

(
    ctx: &BitcoinContext,
    own_address: &Address,
    own_utxos: &[Utxo],
    utxos_mode: SelectUtxosMode,
    primary_output: &PrimaryOutput,
    fee_per_byte: MillisatoshiPerByte,
)