Custom encode/decode parameters

[blobles-dev]

Issue: Encoding large data for networking causes thread locking

Scenario: I network a large table - express.send locks main thread for 0.3s~ (which is unacceptable for loading inventories on player join for example).

Proposed resolution:

I first solved this by chunking my table and then sending chunked gm_express (boo!) messages, which is a bit janky. If any of the messages fail, then the data can't be reconstructed. My current working resolution involved gutting a lot of the core addon removing encode/decode and sending a giant serialised encoded string (serialising/encoding was done in chunks over a timer to prevent threadlocking) sending my string via express.send takes 0.004s which is a massive improvement over the original 0.3s. I have not been able to implement the hashing functionality, but I don't utilise it anyway

Itd be useful if we could specify how the data is encoded or decoded so we can avoid these thread locks through various means - networking data fast is great, but if we're locking up the server thread to encode the data a lot of the use cases are moot.

My idea is essentially..

express.send("msg", data, function(enc)
-- encode data
return specialencode(enc)
end)

Of course, we would need to specify on the receiver how the data is decoded.