Add grpc retry (#1160)

* Add grpc retry

* Update grpc retry

* Add tests

* Fix a bug

* Add api && some tests

* Add comment

* Add double check

* Add server retry quota

* Update optimize code

* Fix bug

* Update optimize code

* Update optimize code

* Fix bug

zrpc/client.go

@@ -14,6 +14,8 @@ var (
 	WithDialOption = internal.WithDialOption
 	// WithTimeout is an alias of internal.WithTimeout.
 	WithTimeout = internal.WithTimeout
+	// WithRetry is an alias of internal.WithRetry.
+	WithRetry = internal.WithRetry
 	// WithUnaryClientInterceptor is an alias of internal.WithUnaryClientInterceptor.
 	WithUnaryClientInterceptor = internal.WithUnaryClientInterceptor
 )
@@ -52,6 +54,9 @@ func NewClient(c RpcClientConf, options ...ClientOption) (Client, error) {
 	if c.Timeout > 0 {
 		opts = append(opts, WithTimeout(time.Duration(c.Timeout)*time.Millisecond))
 	}
+	if c.Retry {
+		opts = append(opts, WithRetry())
+	}
 	opts = append(opts, options...)
 
 	var target string