Configure Xcode project task

[jonnyzzz]

Right now it is hard to attach a K/N Framework into Xcode. Wizards to help, but probably are not enough. The idea is to create a task for the plugin. One calls it with the sourceSet name (of Kotlin/Native Framework) and the path to Xcode project. The task patches Xcode project to include the Framework. The implementation may decide automatically to use CocoaPods integration or not.

I see the following from my own behavior:

• I trust Xcode (only) to create a new iOS project (too many things that my go wrong)
• I have a K/N project with the code to re-use
• I want to try it (it should be a one-click action, not a struggle as of now)
• I'm fine using Xcode and IntelliJ for that (my goal is to reuse code, not to try yet another IDE losing the flow)