[xmltodict] stub improvements and update to 1.0

[tapple-cisco]

• Closes: [stubsabot] Bump xmltodict to 1.0.* #14710
• Closes: [xmltodict] Update to 1.0.* #14712
• Document private class _DictSAXHandler
• Add default values
• Reveal kwargs

[tapple-cisco]

Marking this as draft as it looks like upstream is about to make a new release that changes some types

[tapple-cisco]

Ready for review as xmltodict 1.0 is released and I included it with a merge from @donbarbos

[srittau]

Thanks! (I'm fine with including the internal class as well.) One question and two remarks below.

[srittau]

@tapple-cisco I've merged @donbarbos's PR first to have the correct author information in the repository. Unfortunately, it seems that xmltodict 1.0.1 removed the __author__, __version__, and __license__ fields. Could you remove them and update the version field to ~= 1.0.1?

[tapple-cisco]

@tapple-cisco I've merged @donbarbos's PR first to have the correct author information in the repository. Unfortunately, it seems that xmltodict 1.0.1 removed the __author__, __version__, and __license__ fields. Could you remove them and update the version field to ~= 1.0.1?

I did that before your merge 7f54a8f and I repeated it: 78d836a c11a3ef

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉