Macro module_plugin_dyn_newtype_encode_decode

macro_rules! module_plugin_dyn_newtype_encode_decode {
    ($name:ident) => { ... };
}

Implement Encodable and Decodable for a “module dyn newtype”

“Module dyn newtype” is just a “dyn newtype” used by general purpose Fedimint code to abstract away details of mint modules.