[#205] sdk/client: Support option to set dial timeout

There is a need to set dial timeout in SDK client that is used in case of
internal connection opening. Add DialTimeout option constructor to support
this feature.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/client/opts.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg"
 	"github.com/nspcc-dev/neofs-api-go/pkg/token"
@@ -35,6 +36,8 @@ type (
 	clientOptions struct {
 		addr string
 
+		dialTimeout time.Duration
+
 		grpcOpts *grpcOptions
 	}
 
@@ -168,3 +171,10 @@ func WithGRPCConnection(grpcConn *grpc.ClientConn) Option {
 		option.grpcOpts.conn = grpcConn
 	})
 }
+
+// WithDialTimeout returns option to set connection timeout to the remote node.
+func WithDialTimeout(dur time.Duration) Option {
+	return newFuncClientOption(func(option *clientOptions) {
+		option.dialTimeout = dur
+	})
+}