Iterate over Heliostat parameters in an inner loop, and sun positions in an outer loop

[l3th4l]

Current Implementation incudes:

• Sample num_batches sun positions and heliostat parameter pairs of size batch_size
• Iterate over the batches:

We want an option to change it to the following:

• Sample num_batches_sun sun positions
• Sample num_batches_errors heliostat errors

for sun_positions_batch in sun_positions_batches: 
    for error_parameter_batch in error_parameter_batches:
         model.fit(sun_positions_batch, error_parameter_batch)