[wpimath] Increase constexpr support in geometry data types (#4231)

This uses std::is_constant_evaluated() to conditionally use the gcem library for constexpr calculations.

wpimath/src/main/native/include/frc/geometry/Translation3d.inc

@@ -0,0 +1,44 @@
+// 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 "frc/geometry/Translation2d.h"
+#include "frc/geometry/Translation3d.h"
+#include "units/length.h"
+#include "units/math.h"
+
+namespace frc {
+
+constexpr Translation3d::Translation3d(units::meter_t x, units::meter_t y,
+                                       units::meter_t z)
+    : m_x(x), m_y(y), m_z(z) {}
+
+constexpr Translation2d Translation3d::ToTranslation2d() const {
+  return Translation2d{m_x, m_y};
+}
+
+constexpr Translation3d Translation3d::operator+(
+    const Translation3d& other) const {
+  return {X() + other.X(), Y() + other.Y(), Z() + other.Z()};
+}
+
+constexpr Translation3d Translation3d::operator-(
+    const Translation3d& other) const {
+  return operator+(-other);
+}
+
+constexpr Translation3d Translation3d::operator-() const {
+  return {-m_x, -m_y, -m_z};
+}
+
+constexpr Translation3d Translation3d::operator*(double scalar) const {
+  return {scalar * m_x, scalar * m_y, scalar * m_z};
+}
+
+constexpr Translation3d Translation3d::operator/(double scalar) const {
+  return operator*(1.0 / scalar);
+}
+
+}  // namespace frc