core/memory: Migrate over Write{8, 16, 32, 64, Block} to the Memory class

The Write functions are used slightly less than the Read functions,
which make these a bit nicer to move over.

The only adjustments we really need to make here are to Dynarmic's
exclusive monitor instance. We need to keep a reference to the currently
active memory instance to perform exclusive read/write operations.

src/core/cpu_core_manager.cpp

@@ -25,7 +25,7 @@ CpuCoreManager::~CpuCoreManager() = default;
 
 void CpuCoreManager::Initialize() {
     barrier = std::make_unique<CpuBarrier>();
-    exclusive_monitor = Cpu::MakeExclusiveMonitor(cores.size());
+    exclusive_monitor = Cpu::MakeExclusiveMonitor(system.Memory(), cores.size());
 
     for (std::size_t index = 0; index < cores.size(); ++index) {
         cores[index] = std::make_unique<Cpu>(system, *exclusive_monitor, *barrier, index);