…te (#296)

* Add the ability to update screenshots
* Add the ability to enter screenshot names when captured using the floating button.
* Added authorization with the access token.
* Add support for Screenshots and Real-time update features to work with new access token authorization.
* Added documentation for access token authorization setup.
* Update the screenshot feature to screenshot uploader before adding screenshots. (Download mapping)
* Added separate subspec/package for tests with the ability to search localized strings on the current screen.
* Add new methods needed to upload screenshots from tests with screenshot images and control information.
* Adjust code to make the ability to search localized strings in tests.
* Setup simple UI test example for capturing 2 screenshots
* Update SDK code to make work CrowdinSDK.startWithConfigSync and prepareSync(ScreenshotUploader) methods.
* Adopt example project to work with tests(hide settings button in tests)
* Update documentation.

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Co-authored-by: Andrii Bodnar <andrii.bodnar@crowdin.com>