Allow providing a function string | LiveQuery<T> with useLiveQuery

[SandroMaglione]

As discussed inside Discord, this PR adds a new accepted signature to useLiveQuery as follows:

export function useLiveQuery<T = { [key: string]: unknown }>(
  liveQueryPromise: () => Promise<string | LiveQuery<T>>,
): LiveQueryResults<T> | undefined

This allows to provide a function returning a query string or a generic LiveQuery to useLiveQuery.

@samwillis I am having some type issues that prevents me from testing the implementation