rpc: add chunked rpc interface (backport #6445) (#6717)

* rpc: add chunked rpc interface (#6445)

(cherry picked from commit d9134063e7)

# Conflicts:
#	light/proxy/routes.go
#	node/node.go
#	rpc/core/net.go
#	rpc/core/routes.go

* fix conflicts

Co-authored-by: Sam Kleinman <garen@tychoish.com>
Co-authored-by: marbar3778 <marbar3778@yahoo.com>

node/node.go

@@ -1028,6 +1028,10 @@ func (n *Node) ConfigureRPC() error {
 
 		Config: *n.config.RPC,
 	})
+	if err := rpccore.InitGenesisChunks(); err != nil {
+		return err
+	}
+
 	return nil
 }