Mark logger/react_native_log.h as a for-frameworks C++ API (#59105)

Summary:
Pull Request resolved: #59105

`react_native_log.h` is how host integrations install a sink for React Native's native logs (`set_react_native_logfunc`, `ReactNativeLogLevel`). It is not reached from any public header, so classify it in the "for frameworks" tier of the C++ stable API by including `FrameworksGuard.h`. Consumers opting into `RN_STRICT_API` get a suppressible warning (silenced with `RN_ALLOW_FRAMEWORKS`) instead of no classification.

The `logger` target now depends on `cxxstableapi` in BUCK, CMake and CocoaPods.

Changelog: [Internal]

Reviewed By: cipolleschi

Differential Revision: D125412015

fbshipit-source-id: 64b44c5d2ca703bee33ca0c33274417b54a47262

Author: j-piasecki

packages/react-native/ReactCommon/logger/CMakeLists.txt

@@ -13,5 +13,5 @@ add_library(logger OBJECT ${logger_SRC})
 
 target_include_directories(logger PUBLIC .)
 
-target_link_libraries(logger glog)
+target_link_libraries(logger glog react_cxxstableapi)
 target_compile_reactnative_options(logger PRIVATE)

packages/react-native/ReactCommon/logger/React-logger.podspec

@@ -31,6 +31,7 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+  s.dependency "React-cxxstableapi"
 
   mark_as_react_native_build(s)
 end

packages/react-native/ReactCommon/logger/react_native_log.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 enum ReactNativeLogLevel {
   ReactNativeLogLevelInfo = 1,
   ReactNativeLogLevelWarning = 2,