explore framework install for iOS

[incanus]

We have a framework script as of 01b4f16. If we were to modify our CocoaPods spec to allow install from this framework, could we:

1. Provide symbolicated/stripped Mapbox.framework zips instead of our current static library zips?
2. Avoid use of use_frameworks! in users' Podfile because we already have a namespaced framework?
3. Make drag and drop install with auto-linking of dependencies more of a reality?

@1ec5 @friedbunny

[1ec5]

With #3183, we’re moving to a dynamic framework as the preferred installation method, so the answer will be yes, yes, and yes.