Add call graph tests for prototype methods injected on class

Author: Napalys

javascript/ql/test/library-tests/CallGraphs/AnnotatedTest/Test.expected

@@ -2,6 +2,7 @@ spuriousCallee
 missingCallee
 | constructor-field.ts:40:5:40:14 | f3.build() | constructor-field.ts:13:3:13:12 | build() {} | -1 | calls |
 | constructor-field.ts:71:1:71:11 | bf3.build() | constructor-field.ts:13:3:13:12 | build() {} | -1 | calls |
+| prototypes.js:19:3:19:13 | baz.shout() | prototypes.js:11:23:11:35 | function() {} | -1 | calls |
 badAnnotation
 accessorCall
 | accessors.js:12:1:12:5 | obj.f | accessors.js:5:8:5:12 | () {} |

javascript/ql/test/library-tests/CallGraphs/AnnotatedTest/prototypes.js

@@ -0,0 +1,25 @@
+class Baz {
+  baz() {
+    /** calls:Baz.greet */
+    this.greet();
+  }
+  /** name:Baz.greet */
+  greet() {}
+}
+
+/** name:Baz.shout */
+Baz.prototype.shout = function() {};
+/** name:Baz.staticShout */
+Baz.staticShout = function() {};
+
+function foo(baz){
+  /** calls:Baz.greet */
+  baz.greet();
+  /** calls:Baz.shout */
+  baz.shout();
+  /** calls:Baz.staticShout */
+  Baz.staticShout();
+}
+
+const baz = new Baz();
+foo(baz);