Bump version to v0.0.3 (#362)

Bump version to 0.0.3.

Bump up sleap-nn version for v0.0.2 (#341)

This PR bumps up version to 0.0.2 to get ready for next release and
updates installation guides.

Add sleap-nn entry points (#300)

This PR introduces a unified CLI interface for SLEAP-NN through a new
`sleap-nn` command that provides subcommands for training (`train`),
tracking (`track`), and evaluation (`eval`) workflows. The
implementation maintains full backward compatibility with existing
entrypoints (`sleap-nn-train`, `sleap-nn-track`, `sleap-nn-eval`).
```bash
# Install the package with extras
uvx --from sleap-nn sleap-nn[torch-cpu]

# Then run your command
uvx sleap-nn train --config-name config.yaml --config-dir configs/
```

Co-authored-by: gitttt-1234 <[email protected]>