[cmd3] Add example and template projects for commands v3 and make hatchbot example idiomatic (#8887)

The `command3` example project contains a program that could plausibly
play in the 2026 rebuilt game. It includes nested mechanisms (`Intake`
has an inner `IntakeWrist` and `IntakeRoller` and is similar to the v2
superstructure concept), swerve drive with localization and path
following (albeit stubbed for sake of example), opmodes and
opmode-scoped commands, and command-scoped triggers.

The template projects are basic skeletons. The larger template includes
a basic command that just increments and prints a counter variable every
time it runs.

The hatchbot v3 example has been refactored to be more idiomatic:
- `RobotContainer` removed
- "Subsystem" names in packages, comments, and classes has been replaced
with "Mechanism"
- Some v2-specific comments and structures have been reworded or deleted
- The Drive mechanism now provides commands for arcade drive and driving
a distance, instead of exposing public methods that write directly to
hardware (which broke encapsulation and made it possible to issue
conflicting hardware requests)

wpilibjExamples/src/main/java/org/wpilib/examples/examples.json

@@ -10,6 +10,22 @@
     "robotclass": "Robot",
     "commandversion": 2
   },
+  {
+    "name": "Commands v3 - REBUILT Robot",
+    "description": "A robot with a drivetrain, intake, and shooter subsystems controlled by the commands v3 framework",
+    "tags": [
+      "Complete Robot",
+      "Commandv3",
+      "DataLog",
+      "Joystick",
+      "Swerve Drive",
+      "OpMode"
+    ],
+    "foldername": "rebuiltcmdv3",
+    "gradlebase": "java",
+    "robotclass": "Robot",
+    "commandversion": 3
+  },
   {
     "name": "Encoder",
     "description": "View values from a quadrature encoder.",