Move Logging to android-common lib

[mahibi]

Android Talk App needs the possibility to write/view/share logfiles.
As i don't want to reinvent the wheel, it's necessary to move code from android-files and/or android-library to android-common so it can be used for all nextcloud android apps.

Related issues:
nextcloud/talk-android#1376
nextcloud/android-common#56

[mahibi]

@tobiasKaminsky could you summarize what should be the steps to get this done and let me know where i can help?

[tobiasKaminsky]

• extract LogsActivity, LoggerImpl, Logger from Files app to common
• adopt in Talk
• adopt in Files (again)