Add .gitignore to exclude codeql symlink and build artifacts

Co-authored-by: daedalus <115175+daedalus@users.noreply.github.com>

Author: Copilot

.gitignore

@@ -0,0 +1,8 @@
+_codeql_detected_source_root
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+*.egg-info/
+dist/
+build/