support usual selection/clipboard behaviors in log tail

[garethsparks]

When I access a log tail, I am usually looking to copy some of it and put it into an editor so i'm not "chasing the tail". I think this is typical, expected use.

Expected behaviors:

• I expect to be able to ctrl-A (or similar with context menu or buttons) in the log widow and get the full (loaded in memory) text of the log, instead of a bunch of junk UI text and the small part of the log that's visible in viewport.
• Then I'd expect to be able to use ctrl-C (or context menu/UI buttons) to copy my full selection to clipboard. Not just what's visible in viewport.

Related UX notes:

• Download > "Visible Logs" / "All logs" seem like semifunctional placeholders for the above, more usual, behavior
• "Visible Logs" doesn't have a specific clear meaning since that could be what's visible in the window or the range of logs that are loaded in a tail. I have no idea what these buttons do until I experiment (and then I'm disappointed because it's not actually very helpful, given how key logs are to devops and debugging)

[garethsparks]

was going to see if this was worth working but I am feeling like everyone went to k9s 😂