Remove arbitrary priority validation

[samuelallan72]

            if priority <= 0:
                raise TypeError(f"priority needs to be > 0, not {priority}")

and

        if status.priority and status.priority > 100:
            raise ValueError("Status priority cannot be > 100")

These are arbitrary constraints - nothing cares about the value, as long as they're valid floats or ints that can be sorted. Introduces confusion, and potential unexpected crashes:

• Instantiating a Status with priority=200 will succeed, but adding to the pool later will raise an error
• Instantiating 102+ statuses with auto priority will work, but then adding any new status to the pool will crash
• Adding 102+ statuses with manual priorities within these bounds will succeed, but restoring from the charm storage will crash (see Save status priority to charm state #15 )

These may be unlikely, but not impossible.

Remove this validation.