Expose `data_ptr` as a public API

[LittleLittleCloud]

This would be useful for using Torchsharp.Tensor with other cuda libraries, like bitsandbytes.

Code could be

using System;
using System.Runtime.InteropServices;

namespace TorchSharp.BitsAndBytes; 
public static class LibTorchNativeMethod 
{ 
    [DllImport("LibTorchSharp")]
    public static extern IntPtr THSStorage_data_ptr(IntPtr tensor);
}

Usage
https://github.com/LittleLittleCloud/TorchSharp.BitsAndBytes/blob/4167aff6ea4d9f177beb8d5a6a3e3e2c4afc06a9/TorchSharp.BitsAndBytes/BitsAndByteUtils.cs#L81

[alinpahontu2912]

@LittleLittleCloud, thank you for reporting the issue regarding exposing data_ptr as a public API. We appreciate your input, especially as it could enhance interoperability with other CUDA libraries like bitsandbytes.

It's been a while since this issue was raised, so I wanted to check in and see if it’s still relevant or if there have been any developments on your end. Since then, TorchSharp has evolved significantly, and we’d love to hear your thoughts on whether this feature is still needed or if you have found an alternative solution.

If you have any updated information or if there’s anything we can assist you with, please let us know!