Factor helper methods out of ExampleParserOp

- Methods added in core/util/example_proto_helper.{h,cc}
- This is in preparation for supporting a serving use-case
  in which we can bypass an unnecessary serialize/deserialize
  of Example protos by converting to dense/sparse Tensors directly.
- Note that this change is also tested by the python parsing_ops_tes
Change: 120608058

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