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/Syscalls/purge.cpp

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/NonnullRefPtrVector.h>
+#include <Kernel/Library/NonnullLockRefPtrVector.h>
 #include <Kernel/Memory/AnonymousVMObject.h>
 #include <Kernel/Memory/InodeVMObject.h>
 #include <Kernel/Memory/MemoryManager.h>
@@ -20,7 +20,7 @@ ErrorOr<FlatPtr> Process::sys$purge(int mode)
         return EPERM;
     size_t purged_page_count = 0;
     if (mode & PURGE_ALL_VOLATILE) {
-        NonnullRefPtrVector<Memory::AnonymousVMObject> vmobjects;
+        NonnullLockRefPtrVector<Memory::AnonymousVMObject> vmobjects;
         {
             ErrorOr<void> result;
             Memory::MemoryManager::for_each_vmobject([&](auto& vmobject) {
@@ -43,7 +43,7 @@ ErrorOr<FlatPtr> Process::sys$purge(int mode)
         }
     }
     if (mode & PURGE_ALL_CLEAN_INODE) {
-        NonnullRefPtrVector<Memory::InodeVMObject> vmobjects;
+        NonnullLockRefPtrVector<Memory::InodeVMObject> vmobjects;
         {
             ErrorOr<void> result;
             Memory::MemoryManager::for_each_vmobject([&](auto& vmobject) {