[WIP] Fix error handling in Tensor::dimensions for invalid nbDims

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

---

This section details on the original issue you should resolve

<issue_title>Should return error in Tensor::dimensions for invalid nbDims instead of panic</issue_title>
<issue_description>check here for negative values

trtx-rs/trtx/src/tensor.rs

Line 86 in cb83d21

Ok(result.d[..result.nbDims as usize].to_vec())

</issue_description>

Comments on the Issue (you are @copilot in this section)