Task validation

[rekumar]

We need to validate that certain tasks can be executed with the parameters they are given. This is useful both at the experimental design stage (users know if their parameters are valid) and workflow stage (system wont blow itself up with a bad temperature setpoint).

There is a BaseTask.validate() method that is not being used rn. Have this fire upon task instantiation, even if we aren't defining a task_id or lab_view!