[SDL 0129] Add Additional AppHMIType Array iOS

[theresalech]

Proposal: Add Additional AppHMIType Array iOS

This proposal adds a new optional parameter to SDLLifecycleConfiguration allowing for more than one AppHMITypes when using SDLManager.

Review: smartdevicelink/sdl_evolution#375

Steering Committee Decision:

The Steering Committee voted to accept this proposal with the following revision: update secondaryHMITypes to additionalHMITypes. The Steering Committee also noted that removing the existing appType and only using an array would be a good change to include in the next iOS major version release.

These changes have now been reflected in .md file.