Function create_final_cet_sigs 

pub fn create_final_cet_sigs(
    signing_key_index4: u32,
    signing_key_index5: u32,
    signing_pubkey: String,
    other_pubkey: String,
    num_digits: u8,
    oracle_signatures: String,
    cet_value_wildcard: String,
    cet_sighash: String,
    other_adaptor_signature: String,
) -> PyResult<String>

Perform final signing of a CET