Improve debug logs when running BDD tests

I've been spoilt by tools like Behat and so this make it much nicer
because it tells you exactly the feature/scenario/step where it failed.

src/bonsai/test/bim/conftest.py

@@ -0,0 +1,19 @@
+import pytest
+
+# pytest by default doesn't print steps and where it failed. Let's fix that.
+
+
+@pytest.hookimpl
+def pytest_bdd_before_scenario(request, feature, scenario):
+    print(f"\033[94m# {feature.name}\033[0m")
+    print(f"\033[94m## {scenario.name}\033[0m")
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_bdd_after_step(request, feature, scenario, step, step_func, step_func_args):
+    print(f"\033[92m>>> {step.name}\033[0m")
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_bdd_step_error(request, feature, scenario, step, step_func, step_func_args):
+    print(f"\033[1;91m>>> {step.name} <-- FAILED\033[0m")