given an n x m matrix and a value k, find minimum values for all sub-matrixes of size k\n\nexample:\ngiven this matrix:\n```python\n\t[\n        [-1, 5, 4, 1, -3],\n        [4,  3, 1, 1, 6],\n        [2, -2, 5, 3, 1],\n        [8,  5, 1, 9, -4],\n        [12, 3, 5, 8, 1]\n    ]\n```\n\nand a k of `3`\n\nresult:\n\n```python\n[\n\t[-2, -2, -3],\n\t[-2, -2, -4],\n\t[-2, -2, -4]\n]\n```\n\n\n\n\n

given an n x m matrix and a value k, find minimum values for all sub-matrixes of size k\n\nexample:\ngiven this matrix:\npython\n\t[\n        [-1, 5, 4, 1, -3],