Python-pptx

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- fix: 1003 restore read-only enum members

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- fix: 1000 add py.typed

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- fix: 929 raises on JPEG with image/jpg MIME-type
- fix: 943 remove mention of a Px Length subtype
- fix: 972 next-slide-id fails in rare cases
- fix: 990 do not require strict timestamps for Zip
- Add type annotations

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- fix: 912 Pillow<=9.5 constraint entails security vulnerability

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- Add 909 Add imgW, imgH params to `shapes.add_ole_object()`
- fix: 754 _Relationships.items() raises
- fix: 758 quote in autoshape name must be escaped
- fix: 746 update Python 3.x support in docs
- fix: 748 setup's `license` should be short string
- fix: 762 AttributeError: module 'collections' has no attribute 'abc'
(Windows Python 3.10+)

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- Fix 741 _DirPkgReader must implement .__contains__()