Add tests for telemetry queries

java/ql/test/query-tests/Telemetry/ExternalAPIUsage/ExternalAPIUsage.expected

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+| java.time;?;Duration;ofMillis;(long) | 1 |

java/ql/test/query-tests/Telemetry/ExternalAPIUsage/ExternalAPIUsage.qlref

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+Telemetry/ExternalAPIUsages.ql

java/ql/test/query-tests/Telemetry/ExternalAPIUsage/Test.java

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+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+class ExternalApiUsage {
+	public static void main(String[] args) {
+		List<?> foo = new ArrayList(); // already supported
+		Map<String, Object> map = new HashMap<>();
+		map.put("foo", new Object());
+
+		Duration d = java.time.Duration.ofMillis(1000); // not supported
+
+		long l = "foo".length(); // not interesting
+
+		System.out.println(d);
+		System.out.println(map);
+		System.out.println(foo);
+	}
+}

java/ql/test/query-tests/Telemetry/ExternalLibraryUsage/ExternalLibraryUsage.expected

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+rt.jar | 3 |

java/ql/test/query-tests/Telemetry/ExternalLibraryUsage/ExternalLibraryUsage.qlref

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+Telemetry/ExternalLibraryUsage.ql

java/ql/test/query-tests/Telemetry/ExternalLibraryUsage/Test.java

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+import java.util.List;
+import java.util.ArrayList;
+
+class ExternalLibraryUsage {
+	public static void main(String[] args) {
+		List<?> foo = new ArrayList(); // Java Runtime
+		System.out.println(foo);
+	}
+}