[ET-VK] Adding convenience functions in Compute graph to get PushConstantDataInfo for various attributes of a tensor.

Pull Request resolved: https://github.com/pytorch/executorch/pull/7224

This diff adds convenience functions in the Compute graph to get PushConstantDataInfo for various attributes of a tensor.
ghstack-source-id: 257899588
@exported-using-ghexport

Differential Revision: [D66853502](https://our.internmc.facebook.com/intern/diff/D66853502/)

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Co-authored-by: Vivek Trivedi <5340687+trivedivivek@users.noreply.github.com>