[#1677] writecache: Add QoS limiter usage

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/writecache/options.go

@@ -3,6 +3,7 @@ package writecache
 import (
 	"context"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/qos"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	"go.uber.org/zap"
 )
@@ -38,6 +39,8 @@ type options struct {
 	disableBackgroundFlush bool
 	// flushSizeLimit is total size of flushing objects.
 	flushSizeLimit uint64
+	// qosLimiter used to limit flush RPS.
+	qosLimiter qos.Limiter
 }
 
 // WithLogger sets logger.
@@ -136,3 +139,9 @@ func WithFlushSizeLimit(v uint64) Option {
 		o.flushSizeLimit = v
 	}
 }
+
+func WithQoSLimiter(l qos.Limiter) Option {
+	return func(o *options) {
+		o.qosLimiter = l
+	}
+}