Introduce `virtual_transpose()` to `vTensor` for no copy transposition (#5353)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/5353

## Context

With `axis_map` integrated into matrix multiplication, we can now test no-copy transposes for texture backed tensors.

Transposing a tensor can be done without modifying the storage by swapping elements in the tensor's `axis_map`, and also updating the layout of the tensor if the packed dimension was one of the dims that were transposed.
ghstack-source-id: 242802318
exported-using-ghexport

Reviewed By: jorgep31415

Differential Revision: D62652009

fbshipit-source-id: ae1c81a61a92e69aaa689418d7e62a81d8e09a12