Added lexars

lexers/testdata/go.actual

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello World!")
+}
+
+var n int = 0x21 + 1_000
+var n2 float64 = 1e3
+
+func hello(a int) {
+	fmt.Println("Hello World!").Hello()
+
+    return func() int {
+        return i
+    }
+} // One last thing
+
+type Int interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64
+}