gh-151824: Add copy() to ZipFile

[danny0838]

Following the remove() and repack() introduced by #134627, add copy() for performant member copying in a ZIP file.

Moving a member can also be done as a combination of copy(), remove(), and repack() like:

with ZipFile('spam.zip', 'a') as myzip:
    myzip.repack([myzip.remove(myzip.copy('old.txt', 'new.txt'))])

which is required since the filename is stored within the member's local file entry and thus need a gross rewriting.

• Issue: Support copy() for zipfile #151824

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #33234086 | 📁 Comparing 544f13c against main (1b9fe5c)

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3 files changed

± library/zipfile.html
± whatsnew/3.16.html
± whatsnew/changelog.html

[danny0838]

Nicely ping related reviewers in the previous PR: @gpshead, @merwok, @jaraco, @emmatyping, @AA-Turner.