[#421] Try using badger for the write-cache

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

pkg/local_object_storage/writecache/writecachebadger/gc.go

@@ -0,0 +1,31 @@
+package writecachebadger
+
+import (
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+)
+
+func (c *cache) runGCLoop() {
+	c.wg.Add(1)
+
+	go func() {
+		defer c.wg.Done()
+
+		t := time.NewTicker(c.gcInterval)
+		defer t.Stop()
+
+		for {
+			select {
+			case <-c.closeCh:
+				return
+			case <-t.C:
+				// 0.5 is the recommended value so that write amplification of the value log is 2.
+				// See https://pkg.go.dev/github.com/dgraph-io/badger/v4#DB.RunValueLogGC for more info.
+				for c.db.RunValueLogGC(0.5) == nil {
+					c.log.Debug(logs.WritecacheDBValueLogGCRunCompleted)
+				}
+			}
+		}
+	}()
+}