Add stub generation tests

Author: atorralba

java/ql/test/query-tests/Stubs/Minimal/MinimalStubsFromSource.expected

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+noGeneratedStubs
+multipleGeneratedStubs
+#select
+| org.test.SampleAnnotationType | // Generated automatically from org.test.SampleAnnotationType for testing purposes\n\npackage org.test;\n\nimport java.lang.annotation.Annotation;\nimport java.lang.annotation.ElementType;\nimport java.lang.annotation.Target;\n\n@Target(value={ElementType.METHOD})\npublic @interface SampleAnnotationType\n{\n}\n |
+| org.test.SampleType | // Generated automatically from org.test.SampleType for testing purposes\n\npackage org.test;\n\n\npublic class SampleType\n{\n    public Object sampleField = null;\n    public SampleType(){}\n    public void sampleMethod(){}\n}\n |

java/ql/test/query-tests/Stubs/Minimal/MinimalStubsFromSource.qlref

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+utils/stub-generator/MinimalStubsFromSource.ql

java/ql/test/query-tests/Stubs/Minimal/Test.java

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+import org.test.SampleAnnotationType;
+import org.test.SampleType;
+
+public class Test {
+
+    @SampleAnnotationType
+    public void test() {
+        new SampleType().sampleField = null;
+        new SampleType().sampleMethod();
+    }
+
+}
+

java/ql/test/query-tests/Stubs/Minimal/options

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+//semmle-extractor-options: --javac-args -cp ${testdir}/testlib.jar

java/ql/test/query-tests/Stubs/Minimal/testlib.jar

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+# testlib
+
+Library for testing stub generation (we need a binary dependency because normal stubs are source files, and thus are excluded by the stub generator).
+
+Run `generate.sh` to update `testlib.jar` in the test directory.

java/ql/test/query-tests/Stubs/testlib/README.md

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+#/bin/bash
+javac org/test/*.java
+jar cf ../Minimal/testlib.jar org/test/*.class

java/ql/test/query-tests/Stubs/testlib/generate.sh

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+package org.test;
+
+import java.lang.annotation.Target;
+import java.lang.annotation.ElementType;
+
+@Target(ElementType.METHOD)
+public @interface SampleAnnotationType {
+
+}

java/ql/test/query-tests/Stubs/testlib/org/test/SampleAnnotationType.java

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+package org.test;
+
+public class SampleType {
+
+    public Object sampleField;
+
+    public void sampleMethod() {}
+}