Move Performance files to web/performance/

Move 60 performance-related files from webcore/ to web/performance/.
Includes Performance API, PerformanceObserver, Timing, Marks, Measures,
ResourceTiming, ServerTiming, and NetworkLoadMetrics.

Added JSDOMWrapperCache.h include to JSPerformanceEntryCustom.cpp.
Updated cmake/Sources.json and cmake/targets/BuildBun.cmake.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

cmake/Sources.json

@@ -85,6 +85,7 @@
       "src/buntime/web/compression/*.cpp",
       "src/buntime/web/events/*.cpp",
       "src/buntime/web/streams/*.cpp",
+      "src/buntime/web/performance/*.cpp",
       "src/bake/*.cpp",
       "src/deps/*.cpp",
       "src/vm/*.cpp",

cmake/targets/BuildBun.cmake

@@ -896,6 +896,7 @@ target_include_directories(${bun} PRIVATE
   ${CWD}/src/buntime/web/compression
   ${CWD}/src/buntime/web/events
   ${CWD}/src/buntime/web/streams
+  ${CWD}/src/buntime/web/performance
   ${CWD}/src/buntime/modules
   ${CWD}/src/js/builtins
   ${CWD}/src/napi

src/buntime/web/performance/JSPerformanceEntryCustom.cpp

@@ -33,6 +33,7 @@
 #include "JSPerformanceEntry.h"
 
 #include "JSDOMBinding.h"
+#include "JSDOMWrapperCache.h"
 #include "JSPerformanceMark.h"
 #include "JSPerformanceMeasure.h"
 // #include "JSPerformanceNavigationTiming.h"