Macro impl_task_type_enum 

macro_rules! impl_task_type_enum {
    ($(
        $task:ident {
            output: $output:ty,
            adapter: $adapter:ty,
            input: $input_kind:ident,
            constructor: $constructor:ident,
            conversion: $conversion:ident,
            name: $name:literal,
            doc: $doc:literal,
        }
    ),* $(,)?) => { ... };
}

Generates the TaskType enum from the task registry.