[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/constants.py

@@ -0,0 +1,51 @@
+#
+# 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.
+#
+
+#
+# The constants module is a convenience place for teams to hold robot-wide
+# numerical or boolean constants. Don't use this for any other purpose!
+#
+
+import math
+import wpilib
+
+# Motors
+kLeftMotor1Port = 0
+kLeftMotor2Port = 1
+kRightMotor1Port = 2
+kRightMotor2Port = 3
+
+# Encoders
+kLeftEncoderPorts = (0, 1)
+kRightEncoderPorts = (2, 3)
+kLeftEncoderReversed = False
+kRightEncoderReversed = True
+
+kEncoderCPR = 1024
+kWheelDiameterInches = 6
+# Assumes the encoders are directly mounted on the wheel shafts
+kEncoderDistancePerPulse = (kWheelDiameterInches * math.pi) / kEncoderCPR
+
+# Hatch
+kHatchSolenoidModuleType = wpilib.PneumaticsModuleType.CTRE_PCM
+kHatchSolenoidModule = 0
+kHatchSolenoidPorts = (0, 1)
+
+# Autonomous
+kAutoDriveDistanceInches = 60
+kAutoBackupDistanceInches = 20
+kAutoDriveVelocity = 0.5
+
+# Operator Interface
+kDriverControllerPort = 0
+
+# Physical parameters
+kDriveTrainMotorCount = 2
+kTrackWidth = 0.381 * 2
+kGearingRatio = 8
+kWheelRadius = 0.0508
+
+# kEncoderResolution = -