Improve coverage

- Disable JIT in coverage GH workflow
- Remove features.py script which is not part of the public API

Author: raphaelvallat

.github/workflows/python_tests.yml

@@ -127,6 +127,8 @@ jobs:
 
   coverage:
     runs-on: ubuntu-latest
+    env:
+      NUMBA_DISABLE_JIT: "1"
     steps:
       - uses: actions/checkout@v6