Allow for simple PARSynthesizer constraints

[lajohn4747]

resolves #1936
CU-86b04v6vb

Allow for constraints for PARSynthesizer but only for select cases:

• You can only use a constraint for columns that are all contextual, or all non-contextual
• You cannot supply multiple overlapping constraints (that is 2 constraints that each independently act on the same column)
• You cannot use it for custom constraints (for now, as it is complicated with a custom constraint to determine whether points 1 and 2 can be met).

[sdv-team]

Task linked: CU-86b04v6vb SDV - Allow constraints in PARSynthesizer (for all context cols, or all non-context columns) #1936

[frances-h]

Can we add an integration test as well?