Set CxxModule instance before retrieving Method vector (#32719)

Summary:
Allows `CxxModule` objects to set their `instance_` member before `getMethods()` is invoked, allowing for the `Method` callbacks to capture a weak reference to `getInstance()` if needed.

## Changelog

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[General] [Fixed] - Set CxxModules' Instance before retrieving their Method vector.

Pull Request resolved: #32719

Test Plan: Ensure this statement swap does not break any scenarios with existing CI validation.

Reviewed By: JoshuaGross

Differential Revision: D32955616

Pulled By: genkikondo

fbshipit-source-id: fd7a23ca2c12c01882ff1600f5aef86b1fe4a984

ReactCommon/cxxreact/CxxNativeModule.cpp

@@ -244,8 +244,8 @@ void CxxNativeModule::lazyInit() {
   module_ = provider_();
   provider_ = nullptr;
   if (module_) {
-    methods_ = module_->getMethods();
     module_->setInstance(instance_);
+    methods_ = module_->getMethods();
   }
 }