Cross-library support improvements for 2.0.0-beta02

[sergio-sastre]

AndroidUiTestingUtils 2.0.0-beta01 has been released with support for cross-library screenshot tests but with limited support. Some of those limitations are:

• Only for screenshot testing Composables (Android View system missing)
• Locales are only supported in their most simple form e.g. "en" or "sr", but not complex ones like "sr-Latn-RS" (Paparazzi issue only)
• No out-of-the-box support for all popular libraries (e.g. Facebook screenshot testing, and ndpt/android-testify)
• Library specific options are not fully covered, e.g. no ImageComparator for Dropshots.