gh-138310: Adds sys.audit event for import_module (#138311)

* Updates sys.audit calls for imports to include import_module
* Adds unit tests for existing and new functionality

Lib/importlib/_bootstrap.py

@@ -1307,6 +1307,14 @@ def _sanity_check(name, package, level):
 
 def _find_and_load_unlocked(name, import_):
     path = None
+    sys.audit(
+        "import",
+        name,
+        path,
+        getattr(sys, "path", None),
+        getattr(sys, "meta_path", None),
+        getattr(sys, "path_hooks", None)
+    )
     parent = name.rpartition('.')[0]
     parent_spec = None
     if parent: