Import Python typing module as _typing to avoid name clashes.

resolves opencv/opencv-python#901
resolves #24352

Changes:

# __init__.pyi

# Import section update

import typing as _typing

# Re-export section update

from cv2 import typing as typing

# Python `typing` module usage update

@_typing.overload
def solveLP(Func: UMat, Constr: UMat, z: UMat | None = ...) -> tuple[int, UMat]: ...

Test file content:

import typing
import cv2
import cv2.typing

if typing.TYPE_CHECKING:
    reveal_type(cv2.typing.MatLike)
    reveal_type(cv2.imdecode)
    reveal_type(cv2.cuda.unregisterPageLocked)

Command: mypy test.py

Output:

test.py:6: note: Revealed type is "typing._SpecialForm"
test.py:7: note: Revealed type is "Overload(def (buf: Union[cv2.mat_wrapper.Mat, numpy.ndarray[Any, numpy.dtype[numpy.generic]]], flags: builtins.int) -> Union[cv2.mat_wrapper.Mat, numpy.ndarray[Any, numpy.dtype[numpy.generic]]], def (buf: cv2.UMat, flags: builtins.int) -> Union[cv2.mat_wrapper.Mat, numpy.ndarray[Any, numpy.dtype[numpy.generic]]])"
test.py:8: note: Revealed type is "def (m: Union[cv2.mat_wrapper.Mat, numpy.ndarray[Any, numpy.dtype[numpy.generic]]])"

FYI: @Avasam, @rassie

Pull Request Readiness Checklist

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• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake