Rearrange project files.

include/internal/vase/buffer/buffer.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "pch.h"
+
+struct Buffer {
+  virtual const char *read(uint64_t pos) = 0;
+  virtual uint64_t length() = 0;
+  virtual ~Buffer() = default;
+};