Split is_equal_approx into float and double versions to match Godot

https://github.com/godotengine/godot/pull/48882

src/variant/basis.cpp

@@ -110,7 +110,7 @@ bool Basis::is_diagonal() const {
 }
 
 bool Basis::is_rotation() const {
-	return Math::is_equal_approx(determinant(), 1, UNIT_EPSILON) && is_orthogonal();
+	return Math::is_equal_approx(determinant(), (real_t)1, (real_t)UNIT_EPSILON) && is_orthogonal();
 }
 
 #ifdef MATH_CHECKS

src/variant/quaternion.cpp

@@ -86,7 +86,7 @@ Quaternion Quaternion::normalized() const {
 }
 
 bool Quaternion::is_normalized() const {
-	return Math::is_equal_approx(length_squared(), 1.0, UNIT_EPSILON); //use less epsilon
+	return Math::is_equal_approx(length_squared(), (real_t)1.0, (real_t)UNIT_EPSILON); //use less epsilon
 }
 
 Quaternion Quaternion::inverse() const {