Create a module to split test case collection from checks

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/scripts/collect_test_cases.py b/tests/scripts/collect_test_cases.py
new file mode 100644
index 0000000..7e9031c
--- /dev/null
+++ b/tests/scripts/collect_test_cases.py
@@ -0,0 +1,4 @@
+"""Discover all the test cases (unit tests and SSL tests)."""
+
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later