初步实现bfs原型（仅用于实验）

internal/utils/bfs/blocks_file_options.go

@@ -0,0 +1,18 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package bfs
+
+type BlockFileOptions struct {
+	BytesPerSync int64
+	MaxOpenFiles int // TODO 需要实现，主要用于OpenFileReader
+}
+
+func (this *BlockFileOptions) EnsureDefaults() {
+	if this.BytesPerSync <= 0 {
+		this.BytesPerSync = 1 << 20
+	}
+}
+
+var DefaultBlockFileOptions = &BlockFileOptions{
+	BytesPerSync: 1 << 20,
+}