Example 1:
Input: m = 2, n = 2, maxMove = 2, startRow = 0, startColumn = 0
Output: 6
Example 2:
Input: m = 1, n = 3, maxMove = 3, startRow = 0, startColumn = 1
Output: 12
There is an m x n grid with a ball. The ball starts at [startRow, startColumn]. On each move, the ball can move to an adjacent cell in one of four directions.
Return the number of paths that move the ball out of the grid boundary in at most maxMove moves. Because the answer can be very large, return it modulo 10^9 + 7.
1 <= m, n <= 500 <= maxMove <= 500 <= startRow < m0 <= startColumn < n