feat(goctl/rpc): support external proto imports with cross-package ty… (#5472)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tools/goctl/rpc/cli/cli.go

@@ -98,6 +98,7 @@ func RPCNew(_ *cobra.Command, args []string) error {
 	ctx.IsGenClient = VarBoolClient
 	ctx.Module = VarStringModule
 	ctx.NameFromFilename = VarBoolNameFromFilename
+	ctx.ProtoPaths = []string{filepath.Dir(src)}
 
 	grpcOptList := VarStringSliceGoGRPCOpt
 	if len(grpcOptList) > 0 {