[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/commands/grabhatch.py

@@ -0,0 +1,20 @@
+#
+# 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 commands2
+from subsystems.hatchsubsystem import HatchSubsystem
+
+
+class GrabHatch(commands2.Command):
+    def __init__(self, hatch: HatchSubsystem) -> None:
+        self.hatch = hatch
+        self.addRequirements(hatch)
+
+    def initialize(self) -> None:
+        self.hatch.grabHatch()
+
+    def isFinished(self) -> bool:
+        return True