python,misc: Add check-ast hook to pre-commit

This verifies all Python files have a AST indicating they valid Python.
No file in the repo fails this test, so it triggered no changes.

Change-Id: Ifd7998268df6be766d92c19cfc7f1cfdf8ed103e

.pre-commit-config.yaml

@@ -62,6 +62,7 @@ repos:
           - id: check-added-large-files
           - id: mixed-line-ending
             args: [--fix=lf]
+          - id: check-ast
           - id: check-case-conflict
           - id: requirements-txt-fixer
     - repo: https://github.com/jumanjihouse/pre-commit-hook-yamlfmt