ci: Add script to check for pickle usage in community (#22863)

Add script to check for pickle usage in community.

libs/community/scripts/check_pickle.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+#
+# This checks for usage of pickle in the package.
+#
+# Usage: ./scripts/check_pickle.sh /path/to/repository
+#
+# Check if a path argument is provided
+if [ $# -ne 1 ]; then
+  echo "Usage: $0 /path/to/repository"
+  exit 1
+fi
+
+repository_path="$1"
+
+# Search for lines matching the pattern within the specified repository
+result=$(git -C "$repository_path" grep -E 'pickle.load\(|pickle.loads\(' | grep -v '# ignore\[pickle\]: explicit-opt-in')
+
+# Check if any matching lines were found
+if [ -n "$result" ]; then
+  echo "ERROR: The following lines need to be updated:"
+  echo "$result"
+  echo "Please avoid using pickle or cloudpickle."  
+  echo "If you must, then add:"
+  echo "1. A security notice (scan the code for examples)"
+  echo "2. Code path should be opt-in."
+  exit 1
+fi