Improve Tiler with adaptive tile grid computation

[franioli]

Now you have to statically define the number of tiles and the Tiler compute the limits of the tiling grid. We should also give the possibility to set the tile length and compute the tiling grid accordingly and introduce an auto mode to automatically compute the tiling grid based on the available GPU memory and the chosen extractor/matcher approach.

e.g., use Kornia approaches for extracting patches https://kornia.readthedocs.io/en/latest/contrib.html#image-patches