Toeplitz Matrix

Problem

Given an m x n matrix, determine if it is Toeplitz.

A matrix is considered Toeplitz if every diagonal from the top-left to the bottom-right has identical elements. For each element in the matrix, check if it matches the element in the next row and column.

Return true if all diagonals contain identical elements; otherwise, return false.

Examples

/*
[
  [2,4,6],
  [8,2,4],
  [10,8,2]
]
*/
isToeplitzMatrix([[2,4,6],[8,2,4],[10,8,2]])
// true
/* Why? The diagonals in this matrix are:
"[10]", "[8, 8]", "[2, 2, 2]", "[4, 4]", "[6]".
Each diagonal consists of the same elements, so the answer is true. */

isToeplitzMatrix([[5,10],[10,10]])
// false
// The diagonal "[5, 10]" has different elements, so it's not Toeplitz.