Cleanup for the destructor in Tensor class

[gouthamk16]

TODO item for ensuring proper cleanup in the Tensor class's del method. The implementation now includes a try-except block to handle cases where the lib may be unavailable during Python interpreter shutdown. This prevents potential exceptions from being raised and ensures that Tensor objects are cleaned up safely.

Changes:
-> Added a try-except block in the del method to handle cleanup safely.
-> The lib.tensor_free function is now called only if the lib is available, avoiding issues during interpreter shutdown.

[karpathy]

I guess I still don't fully understand the interpreter <-> cffi interaction here and if there is a "proper" way to do handle this.

[gouthamk16]

Oh. Let me see if i can work on the python cffi connection and if there is any other way to do this properly.