Replace drop/list/view commands with pipelines command

[bentsherman]

Close #5959

This PR moves the drop, list, and view commands into a single pipelines command:

• these commands all pertain to managing the pipeline cache
• they are very generic names which can be confusing as we add more top-level commands
• list is too similar to lint, easy to misspell

I was originally going to move clone and pull as well, but I'm not sure if there's a clean way to support CLI options for these subcommands with JCommander. I refactored the main three commands to not have any extra options, but I don't think I can do this for clone and pull. Also, moving the pull command might be more disruptive anyway.

Long-term, I think we could introduce a CLI v2 called nf with (1) GNU-style options, (2) picocli over JCommander, and (3) a refactored command tree. So for now I'm happy to just merge this change as a short-term improvement.

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[bentsherman]

One consideration might be to align the pipelines view command with cid show (i.e. lineage show). Would be nice to use the same word for both

[pditommaso]

Let's postpone this, post 25.04. There's no hurry

[bentsherman]

At that point we might as well not do it, we'll likely have CLI v2 by then

[bentsherman]

Yeah, let's just do this in CLI v2