Add WebNN API operations tests
This PR is to add some conformance tests (Float32) for WebNN API operations of first-wave models.
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Add tests for WebNN API concat / reshape / slice / split / squeeze / transpose operations which just manipulate input tensors
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Add tests for WebNN API clamp / relu operations which just simply compute input tensors
Above 8 operations have 0 ULP (unit of least precision) distance between actual data with expected data on different HW devices.
@dontcallmedom @Honry I've updated this PR, please take another look, thanks.
Close it. Thanks all for your much reviewing this big PR. Now this PR has been separated smaller PRs according to your feedbacks and suggestions, please continue to help me review the later smaller PRs, thanks.