Function amq_protocol_codegen::snake_case

pub fn snake_case(name: &str, raw: bool) -> String

Convert input to snake case For the purpose of the AMQP codegen usage, we also handle a few special cases: "type" and "return" become "kind" and "r#return" if raw is true A word needs to be composed of at least two letters, this makes UInt become uint and not u_int