Add coverage files to .gitignore and remove .coverage from tracking

Author: sid-rl

.coverage

@@ -14,4 +14,13 @@ dist
 codegen.log
 Brewfile.lock.json
 
-.DS_Store
+.DS_Store
+
+# Coverage files
+.coverage
+.coverage.*
+htmlcov/
+coverage.json
+coverage-summary.json
+*.cover
+.pytest_cache/