LibJS: Stub out Atomics.wait and Atomics.waitAsync

We don't have the facilities to implement these methods fully (namely, a
fully realized SharedArrayBuffer). But we can implement enough to
validate the values passed in by the user.

Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h

@@ -575,6 +575,8 @@ namespace JS {
     P(value)                                 \
     P(valueOf)                               \
     P(values)                                \
+    P(wait)                                  \
+    P(waitAsync)                             \
     P(warn)                                  \
     P(weekOfYear)                            \
     P(weekday)                               \