Add ZipInfo.mode property

[dignissimus]

BPO	47200
Nosy	@Yhg1s, @ethanfurman, @serhiy-storchaka, @dignissimus
PRs	gh-91356: Add ZipInfo.mode attribute #32252
Files	sam_ezeh.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-04-02.12:21:15.631>
labels = ['type-feature', 'library', '3.11']
title = 'Add ZipInfo.mode property'
updated_at = <Date 2022-04-02.21:29:27.246>
user = 'https://github.com/dignissimus'

bugs.python.org fields:

activity = <Date 2022-04-02.21:29:27.246>
actor = 'ethan.furman'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-04-02.12:21:15.631>
creator = 'sam_ezeh'
dependencies = []
files = ['50715']
hgrepos = []
issue_num = 47200
keywords = ['patch']
message_count = 1.0
messages = ['416550']
nosy_count = 5.0
nosy_names = ['twouters', 'alanmcintyre', 'ethan.furman', 'serhiy.storchaka', 'sam_ezeh']
pr_nums = ['32252']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue47200'
versions = ['Python 3.11']

[dignissimus]

Initially, I was looking at bpo-18262 and saw the following Stack Overflow thread that was linked.

https://stackoverflow.com/questions/434641/how-do-i-set-permissions-attributes-on-a-file-in-a-zip-file-using-pythons-zip/6297838

I've attached a patch that gives ZipInfo objects a ZipInfo.mode property getter and setter to get and set the file mode.

I considered adding ZipFile.chmod but I didn't know how it would work given that archives can contain duplicate files.

As an aside, I wondered if there's a way to update file attributes inside zip archives without deleting and rewriting them and if not, whether it would be worthwhile to add one.

[gpshead]

While the supplied patch adding a property for mode makes sense, I think it'd need to go a little further and handle things like the 0o40000 bit for Directory and whatever other potential bits zip files are able to represent. not just the base 9-bit posix mode values.