Implement Multitype Hyperparameter

[pvk-developer]

Nowadays most of the Hyperparameters are using a multi type value where their value can take several values, at the moment BTB is missing a MultiTypeHyperparam class.

These hyperparameters consist of a single value which can have multiple types and different
conditions depending on the type.
An example of this would be a hyperparameter that can be either:

• None
• A float value between 0 and 1
• An integer value
• One of auto, mean, min, max.