Browser+LibWeb+WebContent: Add ability to inspect session storage

Author: https://github.com/Sauler
Commit: b162b7eec6
Pull-request: https://github.com/SerenityOS/serenity/pull/13963
Reviewed-by: https://github.com/linusg

Userland/Services/WebContent/WebContentServer.ipc

@@ -49,5 +49,5 @@ endpoint WebContentServer
     set_is_scripting_enabled(bool is_scripting_enabled) =|
 
     get_local_storage_entries() => (OrderedHashMap<String,String> entries)
-
+    get_session_storage_entries() => (OrderedHashMap<String,String> entries)
 }