android_file_picker 1.0.0

Android implementation of the file_picker plugin.

1.0.0

• Initial release of Android implementation package for file_picker.
• Removed the Apache Tika dependency (~300 KB) used for MIME type detection in saveFile(). MIME types are now resolved from the file name extension via MimeTypeMap, with URLConnection.guessContentTypeFromStream as a content-sniffing fallback when no extension is available. #2101