feat(client): add `refetchWhenOffline` option (#4940)
* feat(client): add `refetchWhenOffline` option
* docs(client): document `refetchWhenOffline` option
* add TODO comment for next major
* feat: improve refetch hook logic
* fix: add todo back
* chore: small refactoring
Co-authored-by: Thang Vu <hi@thvu.dev>
