Add enforce_min_max_datetimes parameter to datetime transformers

[amontanez24]

Problem Description

As a user, it would be good if there was a way to ensure the data reversed by datetime transformers was within the bounds of the real data.

Expected behavior

• Add a boolean parameter called enforce_min_max_datetimes to the UnixTimestampEncoder and OptimizedTimestampEncoder.
• The default value should be False.
• If enabled:
  • the min and max datetimes should be learned during the fit
  • during the reverse transform, the data should be clipped to the bounds learned during fit