[android] Split Expo Go to unversioned and versioned flavors (#12917)

* Add versioning flavors

Extract `flavors.gradle` and fix versioned

* Update manifest based on flavors

* Update fastlan

[android] Split Expo Go to unversioned and versioned flavors (#12917)

* Add versioning flavors

Extract `flavors.gradle` and fix versioned

* Update manifest based on flavors

* Update fastlane build

* Unflavor versioned code

* Update CI to use flavors

* Set default flavor

* Update guides

* Update expotools versioning code

[skip ci]

* [wip] remove flavors from shellapps

* Shell app fallback to `versioned`

* Fix et paths

* Bump `@expo/xdl` in `expotools`

[skip ci]

* Missing uncommitted changes

[skip ci] -expotools yarn.lock, shell app fixes

* Rebase fixes

* Update "Developing Expo Go" guide

[skip ci]

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