Kernel: Make self-contained locking smart pointers their own classes

Until now, our kernel has reimplemented a number of AK classes to
provide automatic internal locking:

- RefPtr
- NonnullRefPtr
- WeakPtr
- Weakable

This patch renames the Kernel classes so that they can coexist with
the original AK classes:

- RefPtr => LockRefPtr
- NonnullRefPtr => NonnullLockRefPtr
- WeakPtr => LockWeakPtr
- Weakable => LockWeakable

The goal here is to eventually get rid of the Lock* classes in favor of
using external locking.

Kernel/Graphics/Console/ContiguousFramebufferConsole.cpp

@@ -9,9 +9,9 @@
 
 namespace Kernel::Graphics {
 
-NonnullRefPtr<ContiguousFramebufferConsole> ContiguousFramebufferConsole::initialize(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch)
+NonnullLockRefPtr<ContiguousFramebufferConsole> ContiguousFramebufferConsole::initialize(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch)
 {
-    return adopt_ref(*new ContiguousFramebufferConsole(framebuffer_address, width, height, pitch));
+    return adopt_lock_ref(*new ContiguousFramebufferConsole(framebuffer_address, width, height, pitch));
 }
 
 ContiguousFramebufferConsole::ContiguousFramebufferConsole(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch)