feat: add floats

tests/float_comparisons.test

@@ -0,0 +1,24 @@
+[code]
+fn is_less_f64(x: f64, y: f64) -> bool {
+    return x < y;
+}
+
+fn is_greater_eq_f32(x: f32, y: f32) -> bool {
+    return x >= y;
+}
+
+[harness]
+#include <stdbool.h>
+
+extern bool is_less_f64(double x, double y);
+extern bool is_greater_eq_f32(float x, float y);
+
+int main() {
+    if (!is_less_f64(3.14, 5.0)) return 1;
+    if (is_less_f64(5.0, 3.14)) return 2;
+    if (!is_greater_eq_f32(2.5f, 2.5f)) return 3;
+    return 0;
+}
+
+[expected_return_code]
+0