Allow passing custom JSRuntimeFactory to DefaultReactHost (#49366)

Summary:
an effort of lean core for jsc: https://github.com/Kudo/discussions-and-proposals/blob/%40kudo/lean-core-jsc/proposals/0836-lean-core-jsc.md

## Changelog:

[ANDROID] [CHANGED] - Allow passing custom JSRuntimeFactory to DefaultReactHost

Pull Request resolved: https://github.com/facebook/react-native/pull/49366

Test Plan:
- ci passed
- test from https://github.com/react-native-community/javascriptcore/pull/4

Reviewed By: cipolleschi

Differential Revision: D69656837

Pulled By: cortinico

fbshipit-source-id: ba8bf744c920a70c10fe5f6743f8dd182c88c4d4