Typing Ergonomics for Docs and Authors Client

When implementing user code that needs to type a parameter that should be either a Doc or Author Client, it currently requires adding quic-rpc as a dependency. The following example shows the current situation:

use iroh_docs::rpc::client::authors::Client;
use iroh_docs::rpc::client::docs::Doc;
use iroh_docs::rpc::proto::{Request, Response};
use quic_rpc::transport::flume::FlumeConnector;

pub struct ApplicationClient {
    // ... //
    blobs: iroh_blobs::rpc::client::blobs::MemClient,
    docs: iroh_docs::rpc::client::docs::MemClient,
}

impl ApplicationClient {
    // ... //
    fn authors(
        &self,
    ) -> Client<FlumeConnector<Response, Request>> {
        self.docs.authors()
    }
    
    async fn create_doc(
        &self,
    ) -> anyhow::Result<Doc<FlumeConnector<Response, Request>>> {
        self.docs.create().await
    }
}

Both the Doc and Blobs Clients have a special type declared to avoid having to make quic-rpc a hard dependency in user code. Could such types be created for both Doc and the Author Client?

Read src/rpc/client/docs.rs, especially the special client type near line 43, then compare the Doc and Author Client definitions in docs.rs and authors.rs. Done means both client types can be used in user-facing parameter and return signatures without requiring users to add quic-rpc as a hard dependency.