Rename cast/constant parameter type to dataType

[fdwr]

The MLOperandDataType is named type for cast and constant but named dataType everywhere else. e.g.

- MLOperand constant(MLOperandDataType type, MLNumber value);
+ ...................MLOperandDataType dataType
- MLOperand cast(MLOperand input, MLOperandDataType type, optional MLOperatorOptions options = {});
+ ................................MLOperandDataType dataType

Other places:

dictionary MLOperandDescriptor {
  required MLOperandDataType dataType;
  ...
};

interface MLOperand {
  readonly attribute MLOperandDataType dataType;
  ...
};

interface MLTensor {
  readonly attribute MLOperandDataType dataType;
  ...
};

dictionary MLArgMinMaxOptions : MLOperatorOptions {
  ...
  MLOperandDataType outputDataType = "int32";
};

Motivation: consistency
Breakage risk: low, since parameter names rather than field or type names.

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[huningxin]

LGTM, thanks @fdwr !