[*] change all std::unordered_map and std::unordered_set into ankerl::unordered_dense::map/set variants (#3442)

mainly doing this to reduce memory footprint; we all know how nice ankerl::unordered_dense is

in theory 4x faster - in practice these maps arent that "hot" anyways so not likely to have much perf gained

i just want to reduce mem fragmentation to ease my porting process, plus it helps other platforms as well (ahem weak Mediatek devices) :)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3442
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/dynarmic/tests/A64/fibonacci.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 /* This file is part of the dynarmic project.
@@ -8,7 +8,7 @@
 
 #include <array>
 #include <exception>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include <catch2/catch_test_macros.hpp>
 #include "dynarmic/common/common_types.h"
@@ -23,7 +23,7 @@ namespace {
 class MyEnvironment final : public A64::UserCallbacks {
 public:
     u64 ticks_left = 0;
-    std::unordered_map<u64, u8> memory{};
+    ankerl::unordered_dense::map<u64, u8> memory{};
 
     u8 MemoryRead8(u64 vaddr) override {
         return memory[vaddr];