v0.1.1 of plugin_universal_in_app_browser

A lightweight Flutter plugin for opening web content through a simple universal in-app browser API. Changelog excerpt: - Added the first public-facing package metadata for release preparation. - Added a simple UniversalInAppBrowserAPI for opening URLs from Flutter. - Added Android support through Chrome Custom Tabs. - Added iOS support through SFSafariViewController. - Added an embedded WebView flow with JavaScript helpers for simple use cases. - Added a small example app and basic tests to help validate the package before publishing.