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

scripts/bump_version.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <new_version>"
+    exit 1
+fi
+
+NEW_VERSION=$1
+
+# Update all pyproject.toml files
+sed -i '' "s/version = \".*\"/version = \"$NEW_VERSION\"/" packages/*/pyproject.toml
+
+echo "Version updated to $NEW_VERSION"