Macro fadroma::entrypoint

macro_rules! entrypoint {
    ($($fadroma:ident)::+, $($contract:ident)::+ $(,)?) => { ... };
    ($($fadroma:ident)::+, $($init:ident)::+, $($handle:ident)::+, $($query:ident)::+ $(,)?) => { ... };
}

Define the mod wasm entrypoint of production builds.