[robotpy][examples] Split examples and snippets (#8944)

This also updates the bazel scripts to behave more like the C++ and Java
examples, and updates the copybara scripts to be able to sync up
`mostrobotpy`

robotpyExamples/examples/HatchbotTraditional/subsystems/hatchsubsystem.py

@@ -0,0 +1,28 @@
+#
+# Copyright (c) FIRST and other WPILib contributors.
+# Open Source Software; you can modify and/or share it under the terms of
+# the WPILib BSD license file in the root directory of this project.
+#
+
+import wpilib
+import commands2
+
+import constants
+
+
+class HatchSubsystem(commands2.Subsystem):
+    def __init__(self) -> None:
+
+        self.hatchSolenoid = wpilib.DoubleSolenoid(
+            constants.kHatchSolenoidModule,
+            constants.kHatchSolenoidModuleType,
+            *constants.kHatchSolenoidPorts
+        )
+
+    def grabHatch(self) -> None:
+        """Grabs the hatch"""
+        self.hatchSolenoid.set(wpilib.DoubleSolenoid.Value.FORWARD)
+
+    def releaseHatch(self) -> None:
+        """Releases the hatch"""
+        self.hatchSolenoid.set(wpilib.DoubleSolenoid.Value.REVERSE)