Initial QSfera import

Server/vendor/go-micro.dev/v4/client/backoff.go

@@ -0,0 +1,14 @@
+package client
+
+import (
+	"context"
+	"time"
+
+	"go-micro.dev/v4/util/backoff"
+)
+
+type BackoffFunc func(ctx context.Context, req Request, attempts int) (time.Duration, error)
+
+func exponentialBackoff(ctx context.Context, req Request, attempts int) (time.Duration, error) {
+	return backoff.Do(attempts), nil
+}