[wpiutil] Change C++ protobuf to nanopb (#7309)

The Google C++ protobuf implementation has issues with dynamic linkage across DLL boundaries because it uses global variables.  It also has a compile-time dependency because the protoc version must exactly match the libprotobuf version.  Using nanopb with a customized generator fixes both of these issues.

Co-authored-by: Gold856 <117957790+Gold856@users.noreply.github.com>

.github/workflows/pregen_all.py

@@ -33,6 +33,13 @@ def main():
         ],
         check=True,
     )
+    subprocess.run(
+        [
+            sys.executable,
+            f"{REPO_ROOT}/wpimath/generate_nanopb.py",
+        ],
+        check=True,
+    )
     subprocess.run(
         [sys.executable, f"{REPO_ROOT}/wpiunits/generate_units.py"], check=True
     )
@@ -53,6 +60,13 @@ def main():
         [sys.executable, f"{REPO_ROOT}/wpilibj/generate_pwm_motor_controllers.py"],
         check=True,
     )
+    subprocess.run(
+        [
+            sys.executable,
+            f"{REPO_ROOT}/wpiutil/generate_nanopb.py",
+        ],
+        check=True,
+    )
     subprocess.run(
         [sys.executable, f"{REPO_ROOT}/thirdparty/imgui_suite/generate_gl3w.py"],
         check=True,