Avoid unpacking NeMo checkpoints before exporting to TRT-LLM
jenkins jenkins jenkins jenkins jenkins jenkins jenkins jenkins
# What does this PR do ?

Replaces the unpacking of .nemo files into a temporary directory before use with direct use of files inside .nemo (which is just a TAR archive), thereby saving many seconds on each export operation.

**Collection**: NLP

# Changelog 
- Replaced unpacking of nemo checkpoints on export with a VFS-like TarPath object.

# Usage
```python
with TarPath('/path/to/archive.tar') as archive:
    myfile = archive / 'filename.txt'
    if myfile.exists():
        data = myfile.read()
        ...
```

**PR Type**:
- [X] New Feature (improvement, rather)
- [ ] Bugfix
- [ ] Documentation
