[cfe] Create various matcher in the body builder

This add the Expression-, Binary-, Cast-, NullAssert-, NullCheck-, List-
and RelationalMatcher and creates these during body building. The
IfCaseStatement is added to support propagation of these to the
inference visitor.

Change-Id: Ia9add15e504cb06af711efc1697a00b8e235e1a4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/263128
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>

Author: johnniwinther

pkg/_fe_analyzer_shared/lib/src/parser/stack_listener.dart

@@ -56,6 +56,7 @@ enum NullValue {
   IdentifierList,
   Initializers,
   Labels,
+  Matcher,
   Metadata,
   MixinApplicationBuilder,
   MatcherList,