#[open_rpc]Expand description
Add a [Service name]OpenRpc struct and implementation providing access to Open RPC doc builder.
This proc macro must be use in conjunction with jsonrpsee_proc_macro::rpc
The generated method open_rpc is added to [Service name]OpenRpc,
ideally we want to add this to the trait generated by jsonrpsee framework, creating a new struct
to provide access to the method is a workaround.
TODO: consider contributing the open rpc doc macro to jsonrpsee to simplify the logics.