Show uptime service

Read how one website is monitored by Uptime Monitor. The id is the website's uptime service id: read it from the `site_preset_uptime` include of a website (`GET /api/public/v1/sites/{site}?include=site_preset_uptime`) or from `meta.updated` of "Assign websites to an uptime configuration". Response attributes: `status` (enabled, disabled), `keyword` (`status`, `type` - `some` at least one keyword must appear, `every` all of them, plan-gated - and `keys`), `redirects` (`status`, `max_redirects`, `expected_url`), `path` (the path checked, null for the website root), `site_status` (the website's last known reachability: `up`, `down`, `unknown` - read-only), `next_request` and the timestamps. These settings read back under the same keys "Update uptime service" accepts. The `preset` relationship carries the global configuration this website uses, included by default. A website that was never assigned a configuration has no uptime service. An uptime service of another organization answers 404.