Add a runtimeConfig to set debugger options

[Saadnajmi]

More context here: facebook/react-native#38942

I made a change a while ago to React Native macOS that never quite landed in React Native to add a runtimeConfig to JSC so we can do things like set the name of the JSContext in Safari WebInpsector, so it's easier to know which target you are debugging if you have multiple React Native instances open. Rather than re-open my PR to RN Core, perhaps it's better I do it here?

[okwasniewski]

Hey @Saadnajmi,

Yeah, I think it's better to re-open the PR here where we can land this change more easily. Setting runtimeConfig makes sense for me

[Saadnajmi]

Sounds good! #17 to address