Dial down on API state notifications

[lidel]

The main issue I'm having right now is repetitive notifications that my ipfs gateway has gone offline....then back online. This seems to happen repeatedly at random times. Would give 4-5 stars if this was fixed. https://addons.mozilla.org/en-US/firefox/addon/ipfs-companion/reviews/1692387/

• We poll every 3s, when machine is under load, this sometimes fail.
• This is related to #721 – we should avoid constant polling, or at least back off when the state did not change for a while.