React Native (#53651)

Summary:
Pull Request resolved: #53651

## Stack
We aim to remove +load methods from the codebase to reduce pre-main startup time and to unblock enabling startup optimizations

## Diff
Diff removes `+load` API from `RCT_EXPORT_MODULE` macro.
It introduces new parameter for `react_native_module_provider` function `eager`, which adds legacy RN modules to newly created socket `REACT_MODULE_EAGER_REGISTRATION_SOCKET`. This socket is invoked right before the RCTBridge is being initialized.

Impact: 137 static loaders are removed from the startup path

## RN
Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D81727845

fbshipit-source-id: 4904499f2e8587717b26579364ed48ffed934774

Author: Yury Dymov

packages/react-native/React/Base/RCTBridgeModule.h

@@ -69,6 +69,7 @@ RCT_EXTERN_C_END
  * will be used as the JS module name. If omitted, the JS module name will
  * match the Objective-C class name.
  */
+#ifndef RCT_FIT_RM_OLD_RUNTIME
 #define RCT_EXPORT_MODULE(js_name)          \
   RCT_EXTERN void RCTRegisterModule(Class); \
   +(NSString *)moduleName                   \
@@ -80,6 +81,17 @@ RCT_EXTERN_C_END
     RCTRegisterModule(self);                \
   }
 
+#else
+
+#define RCT_EXPORT_MODULE(js_name)          \
+  RCT_EXTERN void RCTRegisterModule(Class); \
+  +(NSString *)moduleName                   \
+  {                                         \
+    return @ #js_name;                      \
+  }
+
+#endif // RCT_FIT_RM_OLD_RUNTIME
+
 /**
  * Same as RCT_EXPORT_MODULE, but uses __attribute__((constructor)) for module
  * registration. Useful for registering swift classes that forbids use of load