GuessManagerImpl: support type constrains from DFA, various improvements

Partially fixes IDEA-181794 Suggest completion items with type casts in stream chains if there exists 'filter(x -> x instanceof Foo)' call
Fixes IDEA-182455 Code completion: resolve actual value type assigned to local variable

java/java-tests/testData/codeInsight/completion/normal/StreamDfa_after.java

@@ -0,0 +1,9 @@
+import java.util.*;
+
+class Foo {
+    void test(List<?> obj) {
+        obj.stream()
+          .filter(x -> x instanceof String)
+          .forEach(e -> ((String) e).substring());
+    }
+}