Support `copy()` for `zipfile`

Feature or enhancement

Proposal:

Currently, copying an entry within a ZIP file is cumbersome due to the lack of support for simultaneous reading and writing. The implementer must either:

• Read the entire entry and write afterwards (which is memory-intensive and inefficient for large files), or
• Use a temporary file for buffered copying.

Both approaches are more complex and less performant, due to the need to decompress and recompress data.

It would be much more performant and friendly by implementing a copy() method, using the similar internal buffered copying technique introduced by #134627 with the internal _ZipRepacker.

This also opens the door to support an efficient move() operation, composed of copy(), remove(), and optionally repack().

Linked PRs

• gh-151825

首先閱讀 zipfile 模組的入口，以及 issue #134627 引入的內部 _ZipRepacker 方法。這項變更應支援在封存檔以讀寫方式開啟時有效率地複製項目，並在實作之前確立行為和邊界情況。連結的 PR gh-151825 表示相關工作已經在進行中。