This PR will change the Python type hint for uuid fields from StrictStr to uuid.UUID.

Solves #19485.

I essentially just copied the changes suggested by @to-bee in this comment: #19485 (comment) .

Since this will be a breaking change, should it be hidden behind some flag or option? I opened the pull request against the 8.0.x branch, please change this if it is wrong.

@cbornet @tomplus @krjakbrjak @fa0311 @multani

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