Read Package Version Better

[eitanturok]

In composer, streaming, and MegaBlocks, we read the package version in the setup.py file from the _version.py file. However, in llm-foundry we are missing a _version.py file and instead read the version from the llmfoundry/__init__.py file. This PR changes this.

To ensure consistency with our other repos, I put the package version in the _version.py file. Having a _version.py file better follows good design principles as it is better to separate the version out into its own file.

[snarayan21]

minor change, other than that lgtm

[snarayan21]

lgtm

[eitanturok]

Weird, I initially imported __version__ into the __init__.py file. Looking at the GA logs here, turns out the pycln hook was removing __version__, probably because it was an unused import.

However, when I ran the pre-commit hooks locally, isort removed __version__ because it was an unused import.

To fix this, I added __version__ to the __all__ so it will hopefully think the import is being used.

Not sure what is going on.