[core][android] add getJavaScriptExecutorFactory for js executor factory overriding

[Kudo]

Why

for modules to override the javascript executor factory, e.g. v8

How

add getJavaScriptExecutorFactory to our ReactNativeHostHandler

Test Plan

1. bare-expo launch
2. bare-expo + a module implements getJavaScriptExecutorFactory() and returns JSCExecutorFactory. that would be an expected crash because bare-expo doesn't include libjsc.so

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• This diff will work correctly for expo build (eg: updated @expo/xdl).
• This diff will work correctly for expo prebuild & EAS Build (eg: updated a module plugin).

[lukmccall]

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