feat(publicip): resilient public ip fetcher (#2518)

- `PUBLICIP_API` accepts a comma separated list of ip data sources, where the first one is the base default one, and sources after it are backup sources used if we are rate limited.
- `PUBLICIP_API` defaults to `ipinfo,ifconfigco,ip2location,cloudflare` such that it now has `ifconfigco,ip2location,cloudflare` as backup ip data sources.
- `PUBLICIP_API_TOKEN` accepts a comma separated list of ip data source tokens, each corresponding by position to the APIs listed in `PUBLICIP_API`.
- logs ip data source when logging public ip information
- assume a rate limiting error is for 30 days (no persistence)
- ready for future live settings updates
  - consider an ip data source no longer banned if the token changes
  - keeps track of ban times when updating the list of fetchers

internal/publicip/api/ip2location.go

@@ -31,6 +31,10 @@ func (i *ip2Location) CanFetchAnyIP() bool {
 	return true
 }
 
+func (i *ip2Location) Token() string {
+	return i.token
+}
+
 // FetchInfo obtains information on the ip address provided
 // using the api.ip2location.io API. If the ip is the zero value,
 // the public IP address of the machine is used as the IP.