Add low memory Go test

helloworld/tests/go_low_mem/helloworld.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello, World!")
+}

helloworld/tests/go_low_mem/test.yml

@@ -0,0 +1,5 @@
+language: GO
+time: 2
+memory: 6144
+source: helloworld.go
+expect: AC