JS: Add support for Promise.try

javascript/ql/test/library-tests/TripleDot/promise-try.js

@@ -0,0 +1,29 @@
+async function t1() {
+    const promise = Promise.try(() => {
+        return source('try.1');
+    });
+    sink(await promise); // $ hasValueFlow=try.1
+}
+
+async function t2() {
+    const promise = Promise.try((x) => {
+        return x
+    }, source('try.2'));
+    sink(await promise); // $ hasValueFlow=try.2
+}
+
+async function t3() {
+    const promise = Promise.try((x) => {
+        throw x;
+    }, source('try.3'));
+    promise.catch(err => {
+        sink(err); // $ hasValueFlow=try.3
+    });
+}
+
+async function t4() {
+    const promise = Promise.try((x, y) => {
+        return y;
+    }, source('try.4.1'), source('try.4.2'));
+    sink(await promise); //  $ hasValueFlow=try.4.2
+}