"no p2p service" feedback tracking issue

[b5]

Let's track the state where the p2p node is unavailable, and up the

• running iroh add should still work, ingesting locally. Needs to warn the user that content won't be provided to the network without running p2p.
• iroh add should warn the user they need to be online.
• all p2p subcommands should present p2p service is not running error message when run without the p2p service
• iroh get without any remote resolvers should error out & inform the user they need either a gateway or p2p running

[b5]

currently iroh get with no racing gateway & p2p not running, you get this:

$ iroh get /ipfs/bafybeihjgu5w6wbbxqevdgccj5xm453dbzpkwmkyoepvs3vh6wft4uvf2q/cat.jpg cat.jpg
Error: Connection refused. Are services running?
hint: see 'iroh start' for more on starting services

I think that's enough for the short term, we may need a more thorough error message in the future, but let's confirm with user testing