LibIMAP: Add a new IMAP client and support NOOP

A large commit, but sets up the framework for how the IMAP library will
work. Right now only the NOOP command and response is supported.

Userland/Libraries/LibIMAP/Objects.cpp

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibIMAP/Objects.h>
+
+namespace IMAP {
+
+}