This commit also allows TouchablePreview component to accept any touchable components,
not only the ones included in RN.

What is this?
This PR continues the work on making this project type safe with TypeScript. Goal is that the flag noImplicitAny will be set to true

What this PR does?
* all files inside adapter folder is valid for noImplicitAny!
* resolveAssetSource is now imported from the current place where it should. Previously it was imported from legacy location. More info here: https://facebook.github.io/react-native/docs/image#resolveassetsource
* formatted many files
* add missing interfaces
* fix onPressIn prop on TouchablePreview

What's next?
Next I am planning to make same treatment for commands folder and many it valid for noImplicitAny 🎉

The following PR introduces improved support for Context api and other api's which wrap the root view.

## Context api
Navigation.registerComponent('navigation.playground.ContextScreen', () => (props) => (
  <TitleContext.Provider value={'Title from Provider'}>
    <ContextScreen {...props} />
  </TitleContext.Provider>
), () => ContextScreen);

## Redux
Navigation.registerComponent('navigation.playground.ReduxScreen', () => (props) => (
  <Provider store={reduxStore}>
    <ReduxScreen {...props} />
  </Provider>
), () => ReduxScreen);

## Plain Component - not changed
Navigation.registerComponent('navigation.playground.MyScreen', () => MyScreen);

This PR also upgrades the TypeScript version to 3.2.0 and RN version used in the playground app to 0.57.7

* New Android build flavor - `reactNative57_7`
* Unit test coverage is disabled, for some reason it broke after upgrading to RN 0.57.7

* Refactor peek and pop

* Rollback some XCode stuff

* Added tests for touchablePreview event

* Also fixing searchbarcancelpressed event

* Making sure tests work

This reverts commit 4c519acae8.

* Refactor peek and pop

* Rollback some XCode stuff

* Added tests for touchablePreview event

* Also fixing searchbarcancelpressed event