Epic: Messages: New Observability features for streaming

[Haarolean]

This is an epic to track progress on introducing more observability-focused features to messages functionality.

The list:

• Replay messages from the topics (the same topic and from a different one) (possibly edit them before producing) FE: Messages: Replay (reproduce) message #247
• Load messages from a file
• paste from the clipboard
• Bulk produce
• Messages: Add 'copy to clipboard' button for key,value,headers #323

Copying messages improvements:

• Messages: Add 'copy to clipboard' button for key,value,headers #323
• Download messages as a CSV/JSON #688