refactor(tensor): rename TensorDataIndexView and TensorDataIndexMutView to TensorDataView and TensorDataViewMut, add TensorDataViewExt with expect_view and try_view methods, and update all references accordingly

[crutcher]

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[crutcher]

@laggui: a few questions about the TensorData extension names?

• data.{try,expect}_view() vs data.{try,expect}_index_view()
• Same, but index_mut_view?

Also, notice that I'm re-impl the TensorData::matches_target_dtype method, which is currently private (that needs to change).

[crutcher]

I switched to {try,expect}_index{,_mut}_view()