Use schema package to validate operator inputs

[robcxyz]

Per title, use schema to validate the inputs. This would allow us to do many things.

• Set base operator methods to extend functionality for validation
• Set aliases properly for various parameters
• Raise errors when input is not recognized

Validation should happen in base operator execute method and optionally call an aliasing method prior to running private _execute method. Then set validate method with different data types to trigger logic for validation and call back logic.