Better erlang_service protocol

Summary:
This changes the protocol erlang service uses to communicate between ELP and erlang to be packet and binary based. This will later unlock migrating to a different transport, but for now transport is the same - stdio.

On the ELP side a lot of processing work is moved out of the reader and writer process and into the requesting thread - this should help with scalability. This also significantly simplifies code separating all the concerns and completely removing the concept of a "mismatched sender".

On the Erlang side, segment serialisation work is also moved into the worker thread, out of the main service gen_server - this should also help with scalability.

Reviewed By: alanz

Differential Revision: D58673021

fbshipit-source-id: a0905cd212f12f4d03f7d55ca30293fb1e8921c2

Cargo.toml

@@ -30,6 +30,7 @@ erl_ast = { path = "./crates/erl_ast" }
 always-assert = "0.1.3"
 anyhow = "1.0.70"
 bpaf = { version = "=0.7.9", features = ["derive", "autocomplete", "batteries"] }
+byteorder = "1.5.0"
 codespan-reporting = "0.11.1"
 cov-mark = "2.0.0-pre.1"
 criterion = "0.3.6"

crates/erlang_service/Cargo.toml

@@ -7,6 +7,7 @@ version.workspace = true
 elp_syntax.workspace = true
 
 anyhow.workspace = true
+byteorder.workspace = true
 crossbeam-channel.workspace = true
 eetf.workspace = true
 fxhash.workspace = true