[wpimath] Add remaining struct and protobuf implementations (#5953)

wpimath/src/main/native/include/frc/proto/MatrixProto.h

@@ -0,0 +1,22 @@
+// 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.
+
+#pragma once
+
+#include <wpi/protobuf/Protobuf.h>
+
+#include "frc/EigenCore.h"
+
+template <int Rows, int Cols, int Options, int MaxRows, int MaxCols>
+  requires(Cols != 1)
+struct wpi::Protobuf<frc::Matrixd<Rows, Cols, Options, MaxRows, MaxCols>> {
+  static google::protobuf::Message* New(google::protobuf::Arena* arena);
+  static frc::Matrixd<Rows, Cols, Options, MaxRows, MaxCols> Unpack(
+      const google::protobuf::Message& msg);
+  static void Pack(
+      google::protobuf::Message* msg,
+      const frc::Matrixd<Rows, Cols, Options, MaxRows, MaxCols>& value);
+};
+
+#include "frc/proto/MatrixProto.inc"