Function buffer_hash_to_tx_fetcher

pub fn buffer_hash_to_tx_fetcher(
    tx_fetcher: &mut TransactionFetcher,
    hash: FixedBytes<32>,
    peer_id: FixedBytes<64>,
    retries: u8,
    tx_encoded_length: Option<usize>,
)

Directly buffer hahs into tx fetcher for testing.