[Numpy-discussion] New Feature added to rotate MeshGrid

[Yash Tewatia]

Hi, it is my first contribution to the open-source community, I have tried
to fix issue #19315, which is to add a new feature of rotating mesh grid in
NumPy. It would be great if I get improvements and suggestions for it.

Added functionality of rotating mesh grid which fixes #19315 issue, adds a
feature which works as follows
Parameters
-----------
    xspan : Input_array
          range of values of x in the unrotated matrix.
    yspan : Input_array
          range of values of y in the unrotated matrix.
    angle : float or int
          Angle of rotation, positive for clockwise rotation, negative for
anti-clockwise rotation.
    boolRad : bool
            True if the given angle is in Radians, False if given angle is
            in Degrees.
Returns
--------
out : ndarray
        A new nested array is generated by Einstein Summation after
rotation is applied.

Examples
----------
    >>> xspan = np.linspace(-2*np.pi, 2*np.pi, 3)
    >>> yspan = np.linspace(-2*np.pi, 2*np.pi, 3)
    >>> arr = np.rotateMeshgrid(xspan,yspan,0.4)
    >>> arr
    array([[[-6.32689674, -0.04386455,  6.23916764],
        [-6.28303219,  0.        ,  6.28303219],
        [-6.23916764,  0.04386455,  6.32689674]],

       [[-6.23916764, -6.28303219, -6.32689674],
        [ 0.04386455,  0.        , -0.04386455],
        [ 6.32689674,  6.28303219,  6.23916764]]])

    >>> arr = np.rotateMeshgrid(xspan,yspan,80,False)
    >>> arr
    array([[[ 6.9383701 ,  6.24478659,  5.55120308],
        [ 0.69358351,  0.        , -0.69358351],
        [-5.55120308, -6.24478659, -6.9383701 ]],

       [[-5.55120308,  0.69358351,  6.9383701 ],
        [-6.24478659,  0.        ,  6.24478659],
        [-6.9383701 , -0.69358351,  5.55120308]]])

Code snippet:
(
https://user-images.githubusercontent.com/60055574/131483810-05012ab1-8971-4a94-8b1c-8f11d13b7c02.png
)
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