EPIC - Label and tag plugins 🏷

[DropSnorz]

This issue is an EPIC tracking a set of items to implement minimal plugin labeling/tagging feature in OwlPlug

Requirements

• Add embedded h2 key-value store for persistent storage #320

Implementation

• Feature Request: tag Plugins, like a Sample Manager #18
• Reflect changes from key-value statestore to the app datasource during plugins sync
• Use data-source based filtering for displaying plugins