fix(opentrons-shared-data): fix performance module not being recognized (#14990)

# Overview

Fixes https://opentrons.atlassian.net/browse/RQA-2623

performance directory was missing an `__init__.py`

# Test Plan

- I added a test just to import the module and create one of the objects
inside the dev_types.py. The issue is that the tests don't run against
the built version of the package. I built the app and everything imports
correctly
- I cannot test that opentrons_shared_data is being utilized correctly
on the robot until I have a built buildroot image. Because currently my
robot and app have different versions (due to the dev build) so the app
will not let me trigger an analysis.
- I instead pushed opentrons-shared-data to my robot and verified that
the performance module existed in
`/usr/lib/python3.10/site-packages/opentrons_shared_data`. But I can't
test that the imports actually work until I have the system image and
the app together

# Changelog

- Added `__init__.py` to performance directory to tell python to import
it as a module
- Reorganized performance_helpers.py to not have an import error

# Review requests

- Nothing to block this fix, but what should be done to make sure this
doesn't happen again? This is a weird packaging thing that doesn't show
up when running dev or CI testing.
- I wonder if there is a smoke test we can perform automatically just to
make sure everything imports correctly? Running opentrons.simulate
against the actual built package would have caught this


# Risk assessment

Medium, I mean I can't break it any worse than I already did

Author: DerekMaggio

api/src/opentrons/util/performance_helpers.py

@@ -20,23 +20,6 @@
 )
 
 
-def _handle_package_import() -> Type[SupportsTracking]:
-    """Handle the import of the performance_metrics package.
-
-    If the package is not available, return a stubbed tracker.
-    """
-    try:
-        from performance_metrics import RobotContextTracker
-
-        return RobotContextTracker
-    except ImportError:
-        return StubbedTracker
-
-
-package_to_use = _handle_package_import()
-_robot_context_tracker: SupportsTracking | None = None
-
-
 class StubbedTracker(SupportsTracking):
     """A stubbed tracker that does nothing."""
 
@@ -58,6 +41,23 @@ def store(self) -> None:
         pass
 
 
+def _handle_package_import() -> Type[SupportsTracking]:
+    """Handle the import of the performance_metrics package.
+
+    If the package is not available, return a stubbed tracker.
+    """
+    try:
+        from performance_metrics import RobotContextTracker
+
+        return RobotContextTracker
+    except ImportError:
+        return StubbedTracker
+
+
+package_to_use = _handle_package_import()
+_robot_context_tracker: SupportsTracking | None = None
+
+
 def _get_robot_context_tracker() -> SupportsTracking:
     """Singleton for the robot context tracker."""
     global _robot_context_tracker

shared-data/python/opentrons_shared_data/performance/__init__.py

@@ -0,0 +1 @@
+"""Performance metrics."""

shared-data/python/tests/performance/__init__.py

@@ -0,0 +1,6 @@
+from pathlib import Path
+from opentrons_shared_data.performance.dev_types import RobotContextState
+
+
+def test_metrics_metadata(tmp_path: Path) -> None:
+    RobotContextState.ANALYZING_PROTOCOL