[inspector] support setTimeout in Debugger.scheduleStepIntoAsync method

test/inspector/debugger/schedule-step-into-async-set-timeout-expected.txt

+Checks Debugger.scheduleStepIntoAsync with setTimeout.
+
+Running test: testSetTimeout
+paused at:
+debugger; #setTimeout(() => 1, 0);
+
+paused at:
+debugger; setTimeout(#() => 1, 0);
+
+
+Running test: testDebuggerStmtBeforeCallback1
+paused at:
+debugger; #setTimeout(() => 1, 0);debugger;
+
+paused at:
+debugger; setTimeout(() => 1, 0);#debugger;
+
+paused at:
+#debugger//should-break-here
+
+
+Running test: testDebuggerStmtBeforeCallback2
+paused at:
+debugger; setTimeout(() => 1#, 0);debugger;
+
+paused at:
+#debugger//should-break-here
+
+
+Running test: testSetTimeoutWithoutJS
+paused at:
+debugger; #setTimeout('}', 0);
+setTimeout('var a = 239;', 0);
+
+paused at:
+#debugger//should-break-here
+
+
+Running test: testResume
+paused at:
+#setTimeout(() => 42, 0)
+
+paused at:
+setTimeout(#() => 42, 0)
+