[wpilib] Implement Trajectory.equals() (#2517)

wpilibc/src/main/native/cpp/trajectory/Trajectory.cpp

@@ -151,3 +151,11 @@ void frc::from_json(const wpi::json& json, Trajectory::State& state) {
       units::meters_per_second_squared_t{json.at("acceleration").get<double>()};
   state.curvature = units::curvature_t{json.at("curvature").get<double>()};
 }
+
+bool Trajectory::operator==(const Trajectory& other) const {
+  return m_states == other.States();
+}
+
+bool Trajectory::operator!=(const Trajectory& other) const {
+  return !operator==(other);
+}