STYLE: Add pre-commit hook for debug statements (pandas-dev#41489)

Added https://github.com/pre-commit/pre-commit-hooks#debug-statements
as a pre-commit hook.

Author: klssmith

.pre-commit-config.yaml

@@ -21,6 +21,7 @@ repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v3.4.0
     hooks:
+    -   id: debug-statements
     -   id: end-of-file-fixer
         exclude: \.txt$
     -   id: trailing-whitespace