[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/snippets/QuickVision/robot.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+#
+# 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
+from wpilib.cameraserver import CameraServer
+
+
+class MyRobot(wpilib.TimedRobot):
+    """
+    Uses the CameraServer class to automatically capture video from a USB webcam and send it to the
+    dashboard without doing any vision processing. This is the easiest way to get camera images
+    to the dashboard. Just add this to the robotInit() method in your program.
+    """
+
+    def __init__(self):
+        super().__init__()
+        CameraServer().launch()