Attribute Macro rpc

#[rpc]

Generate a Handler implementation and client helpers for trait input.

Example usage:

#[rpc]
trait MyApi {
    fn my_method(&self, a: usize);
    fn my_other_method(&self) -> bool {}
}

Generated code:

impl Handler for &dyn MyApi {
   ..
}

pub enum my_api {}

impl my_api {
    fn my_method(arg0: usize) -> Result<BoundMethod<'static, ()>, ArgSerializeError> {
         ..
    }

    fn my_other_method() -> Result<BoundMethod<'static, bool>, ArgSerializeError> {
         ..
    }
}