[REQ] Run TensorBoard callback for each parameter combination

[franneck94]

System information

OS Platform and Distribution: All
TensorFlow version: 2.3
Python version: 3.8

Source code / logs

If the user wants to pass a TensorBoard callback to the .fit method of the Grid/Random search, the callback would store the
logs into the same directory.
It would be better to create a sub-directory for each parameter combination.