Support datetimes in GreaterThan constraint

[rollervan]

• SDV version: 0.5.0
• Python version: 3.8
• Operating System: Ubuntu

Description

It raises an error using GreaterThan constraint with handling_strategy=transform.
It works fine for numerical data but fails for datetime data.

What I Did

Here's a reproducible example:

from sdv.tabular import GaussianCopula
from sdv.constraints import UniqueCombinations, GreaterThan, ColumnFormula
from sdv.demo import load_tabular_demo

data = load_tabular_demo('student_placements')
data.head()

date_constraint = GreaterThan(
    low='start_date',
    high='end_date',
    handling_strategy='transform'
)

constraints = [
    date_constraint,
]

model = GaussianCopula(constraints=constraints)
model.fit(data)

Error output:

TypeError: Addition/subtraction of integers and integer-arrays with TimedeltaArray is no longer supported.  Instead of adding/subtracting `n`, use `n * obj.freq`