Function build_transaction_with_fee

Constructs a Bitcoin transaction from the given UTXOs and primary output specification. This function handles the common pattern of Bitcoin transaction construction: 1. Creates inputs from the selected UTXOs 2. Creates the primary output (payment or OP_RETURN data) 3. Adds a change output if the remainder exceeds the dust threshold 4. Returns both the unsigned transaction and previous outputs nee

(
    utxos_to_spend: Vec<&Utxo>,
    own_address: &Address,
    primary_output: &PrimaryOutput,
    fee: u64,
)