chore(testing): add unit tests and update core render/network pipelines

- add new tests:
  - test_blp_loader.cpp
  - test_dbc_loader.cpp
  - test_entity.cpp
  - test_frustum.cpp
  - test_m2_structs.cpp
  - test_opcode_table.cpp
  - test_packet.cpp
  - test_srp.cpp
  - CMakeLists.txt
- add docs and progress tracking:
  - TESTING.md
  - perf_baseline.md
- update project config/build:
  - .gitignore
  - CMakeLists.txt
  - test.sh
- core engine updates:
  - application.cpp
  - game_handler.cpp
  - world_socket.cpp
  - adt_loader.cpp
  - asset_manager.cpp
  - m2_renderer.cpp
  - post_process_pipeline.cpp
  - renderer.cpp
  - terrain_manager.cpp
  - game_screen.cpp
- add profiler header:
  - profiler.hpp

src/network/world_socket.cpp

@@ -4,6 +4,7 @@
 #include "game/opcode_table.hpp"
 #include "auth/crypto.hpp"
 #include "core/logger.hpp"
+#include "core/profiler.hpp"
 #include <iomanip>
 #include <sstream>
 #include <cstdio>
@@ -464,6 +465,7 @@ void WorldSocket::send(const Packet& packet) {
 }
 
 void WorldSocket::update() {
+    ZoneScopedN("WorldSocket::update");
     if (!useAsyncPump_) {
         pumpNetworkIO();
     }