feat: Add StateWrapper to fbjni typings

[mrousavy]

Summary:

In Nitro, we support creating views using Fabric's view system.

We use StateWrapper (and StateWrapperImpl) from C++. While we can use react::StateWrapperImpl from C++, we had to define StateWrapper ourselves (see JStateWrapper.hpp)

StateWrapperImpl inherits from StateWrapper in Kotlin, but the same inheritance is not reflected in C++ via fbjni.

To fix this, we did some dirty static downcasting, which is not safe to do but worked.

Changelog:

[ANDROID] [ADDED] - Add StateWrapper to C++ fbjni types

Test Plan:

When you have a StateWrapperImpl in Kotlin, pass that to C++ via fbjni using the jni::alias_ref<react::StateWrapper> type. (Example; SimpleViewManager.updateState(...) gives you a StateWrapper)

Then try downcasting via jni::dynamic_ref_cast<react::StateWrapperImpl>(...).

If both works, this PR works.