Derive macros for elm_rs::{Elm, ElmEncode, ElmDecode, ElmQuery, ElmQueryField}.

Features

• default: None.
• json: Enables the derive macros for ElmEncode and ElmDecode.
• query: Enables the derive macro for ElmQuery and ElmQueryField.
• serde: Enables compatibility with serde attributes like #[serde(rename_all = "camelCase")].