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

まず、zipfile モジュールのエントリと、issue #134627 で導入された内部アプローチ _ZipRepacker を読みます。この変更では、アーカイブを読み書き用に開いたままエントリを効率的にコピーできるようにし、実装前に動作とエッジケースを確立する必要があります。リンクされた PR gh-151825 は、作業がすでに進行中であることを示しています。