Reorganize tests and benchmark scripts.

Mainly to get rid of one top level directory. But this will
also be useful when there are tests of the embedding API.

test/core/number/equality.wren

@@ -0,0 +1,19 @@
+IO.print(123 == 123)  // expect: true
+IO.print(123 == 124)  // expect: false
+IO.print(-3 == 3)     // expect: false
+IO.print(0 == -0)     // expect: true
+
+// Not equal to other types.
+IO.print(123 == "123") // expect: false
+IO.print(1 == true)    // expect: false
+IO.print(0 == false)   // expect: false
+
+IO.print(123 != 123)  // expect: false
+IO.print(123 != 124)  // expect: true
+IO.print(-3 != 3)     // expect: true
+IO.print(0 != -0)     // expect: false
+
+// Not equal to other types.
+IO.print(123 != "123") // expect: true
+IO.print(1 != true)    // expect: true
+IO.print(0 != false)   // expect: true