Class FloodFill<T>

See: https://en.wikipedia.org/wiki/Flood_fill (Span Filling section)

const grid = [
     [0, 0, 1],
     [1, 0, 0],
     [0, 0, 0]
 ];
 const flood = new FloodFill(grid, (c) => c === 0);

 const result = flood.process({ x: 0, y: 0 });

 console.log(result);

 {
     status: 'Success',
     positions: [
         { x: 0, y: 1 },
         { x: 0, y: 0 },
         { x: 1, y: 2 },
         { x: 1, y: 1 },
         { x: 2, y: 0 },
         { x: 2, y: 2 },
         { x: 2, y: 1 }
     ]
 }