feat: no-cache requests

[Arqu]

It would be useful for testing (and probably other edge cases) to have an option to request a CID which skips the store.get check and directly resolves via p2p. Possibly by a query param or request header.

[Arqu]

This is now on the backburner as we have the gateway checker.

[ramfox]

we have (right now, this will change as the cli becomes more mature) iroh-ctl p2p debug fetch-providers and iroh-ctl p2p debug fetch-bitswap, which pull directly from p2p and don't use the store.