Move avro into memorystore. Refactor

Does not compile

internal/memorystore/level.go

@@ -1,3 +1,8 @@
+// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved. This file is part of cc-backend.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
 package memorystore
 
 import (
@@ -77,7 +82,7 @@ func (l *Level) free(t int64) (int, error) {
 			delme, m := b.free(t)
 			n += m
 			if delme {
-				if cap(b.data) == BUFFER_CAP {
+				if cap(b.data) == BufferCap {
 					bufferPool.Put(b)
 				}
 				l.metrics[i] = nil