Direct memory estimators data type change

Currently direct data estimators do not take into consideration the change of the data type. If the method changes the type, e.g. normalisation, this should be reflected in the library file, e.g., by incorporating the field `output_data_type`.

For example:
`output_data_type: float32`

In addition, it worth remembering that we convert raw uint16 data to float32 after it gets loaded. Some methods can occur before normalisation which might work with uint16. Worth considering if such a strict conversion really necessary early on.