Given the coordinates of four points in 2D space, return whether the four points could construct a square.
The coordinate (x,y) of a point is represented by an integer array with two integers.
Example:
Input: p1 = [0,0], p2 = [1,1], p3 = [1,0], p4 = [0,1] Output: True
Note:
<li>All the input integers are in the range [-10000, 10000].</li>
<li>A valid square has four equal sides with positive length and four equal angles (90-degree angles).</li>
<li>Input points have no order.</li>