Enable strict_optional in aqt/. and aqt/browser #3486
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Related to #3317
I mostly added asserts to get rid of the mypy errors
I couldn't figure out how to get around the error from this line though, so I did type: ignore
https://github.com/bpnguyen107/anki/blob/b39de459b4942686d8301b2aff546560a3431ad5/qt/aqt/browser/table/table.py#L652