Suricata

The trait and generic setup for Rust parsers to return an interator depends on the transactions being available in a slice, which doesn't work for non-vec container types like a VecDeque. I think we can make these even more generic with the following trait methods:

/// Return the number of transactions in the collection.
get_tx_count() -> usize;

/// Get a transaction by its index in the collection.
get_transaction_by_index(index: usize) -> Tx;

I think we already have a get_tx_count. This will work generic over vector and VecDeque transaction containers.