CppLanguageServer: Add test for "get_parameters_hint"

Author: https://github.com/itamar8910
Commit: 2af5bb9083
Pull-request: https://github.com/SerenityOS/serenity/pull/8403
Reviewed-by: https://github.com/awesomekling

Userland/DevTools/HackStudio/LanguageServers/Cpp/Tests/parameters_hint1.cpp

@@ -0,0 +1,8 @@
+void foo(int x, char y);
+
+void bar()
+{
+    foo();
+    foo(123, 'b');
+    foo(
+}