tests: Better suite creation

While the previous method of in-lining a stack allocated array of
tests into the suite struct declaration was nice, we had to update
size manually.

This macro will allow us to just append new tests to the suite without
having to care for that.  It generates a uniquely named variable for
the test array, then uses that test array in the suite declaration.
Nice and easy.

test/test_sv.c

@@ -28,14 +28,7 @@ void sv_copy_test(void)
   }
 }
 
-const test_suite_t SV_SUITE = {
-    .name = "String View Tests",
-    .tests =
-        (test_fn[]){
-            MAKE_TEST_FN(sv_copy_test),
-        },
-    .size = 1,
-};
+MAKE_TEST_SUITE(SV_SUITE, "String View Tests", MAKE_TEST_FN(sv_copy_test), );
 
 /* Copyright (C) 2026 Aryadev Chavali