Lqtop ratatui

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Replace the current ltop with a new version:

• Instead of using crossterm directly, use the ratatui library on top of it.
• Replace the previous mess with a proper async framework and setup for bus wrangling.
• Create abstractions to make it easy to add frames
• New live network graph (line chart of network traffic)
• Updated hosts view
• New flows view, displaying the current flow traffic (just like the web UI)
• New RTT histogram view, matching the web UI.

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I rebased it to develop, but I think the merge will need to be followed by a cargo update to refresh the Cargo.lock file between the various branches we've been working on. Not 100% sure.

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(Go for it was commented in Zulip, so I'll merge it)