build(nix): Package gguf-py (#5664)

build(nix): Package gguf-py (#5664)

* style: format with nixfmt/rfc101-style

* build(nix): Package gguf-py

* build(nix): Refactor to new scope for gguf-py

* build(nix): Exclude gguf-py from devShells

* build(nix): Refactor gguf-py derivation to take in exact deps

* build(nix): Enable pytestCheckHook and pythonImportsCheck for gguf-py

* build(python): Package python scripts with pyproject.toml

* chore: Cleanup

* dev(nix): Break up python/C devShells

* build(python): Relax pytorch version constraint

Nix has an older version

* chore: Move cmake to nativeBuildInputs for devShell

* fmt: Reconcile formatting with rebase

* style: nix fmt

* cleanup: Remove unncessary __init__.py

* chore: Suggestions from review

- Filter out non-source files from llama-scripts flake derivation
- Clean up unused closure
- Remove scripts devShell

* revert: Bad changes

* dev: Simplify devShells, restore the -extra devShell

* build(nix): Add pyyaml for gguf-py

* chore: Remove some unused bindings

* dev: Add tiktoken to -extra devShells