Unify tensor name

[primenumber]

Motivation and Context

Currently, tensor naming in dlk runtime is op.name or op.name + '_' + out_k.
latter naming is used if op has multiple output.
This PR unify naming to op.name + '_' + out_k.

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• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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[primenumber]

/ready

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