Add rankRange to opSupportLimits()

Add rankRange to opSupportLimits() by renaming MLSupportLimits to
MLDataTypeLimits (still used for inputs, constants, and output
operands), and deriving MLTensorLimits (used for tensor operands)
which adds the new member as a MLRankRange dictionary.

This also adds a note about an operand's allowed data types and ranks,
indicating the implementations may extend or impose limits.

Author: inexorabletash