Sentry SDK for Java and Android Files

Fixes

• Do not use named capturing groups for regular expressions (#4652)
• This fixes a crash on Android versions below 8.0 (API level 26)

Features

• Add onDiscard to enable users to track the type and amount of data discarded before reaching Sentry (#4612)
• Stub for setting the callback on Sentry.init: java Sentry.init(options -> { ... options.setOnDiscard( (reason, category, number) -> { // Your logic to process discarded data }); });