fix: add missing scripts directory to git

- Remove scripts/ from .gitignore
- Add build_and_test.sh for local testing
- Add bump_version.sh for version updates (used by CI)
- Add release.sh and upload_to_pypi.sh for publishing
- Fixes CI error: ./scripts/bump_version.sh: No such file or directory

.gitignore

@@ -12,7 +12,6 @@ outputs/
 *.idx 
 *.map
 .history/
-scripts/
 lm_eval.egg-info/
 demo/experiment_results/**/*.json
 *.jsonl