feat(tests): python matrix support test

- Introduced a new argument for selecting the diarization backend in the engine creation.
- Enhanced the `create_engine` function to accept and utilize the specified diarization backend.
- Updated the test runner to accommodate the new backend option for improved flexibility.

pyproject.toml

@@ -57,6 +57,9 @@ diarization-diart = [
     "torchvision<0.24.0",
 ]
 
+[dependency-groups]
+dev = ["rich>=14.3.3"]
+
 [tool.uv]
 conflicts = [
     [