fix: pass timeout arg to server

[achingbrain]

Refactors how we pass url params to the API, all args are now normalised in one place. If a timeout is passed it is passed on to the server as a url search param.

N.b. this does mean that timeouts are set in the client and on the server so it's not always clear which will expire first, though one will expire.

We do our best to ensure the errors are the same, though when the API is streaming there's no way to tell if the request completed successfully or if the timeout occurred as the timeout message arrives in http trailers.

Also fixes a problem we have, where the README says we support passing searchParams as an additional option:

await ipfs.id({
  searchParams: {
    foo: 'bar'
  }
})

yet this ends up getting sent as:

POST /api/v0/id?search-params==%5Bobject+Object%5D

[jacobheun]

Verified against libp2p delegated routing apis. Options are being properly passed into the url params.