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/cloudflare.go

@@ -30,6 +30,10 @@ func (c *cloudflare) CanFetchAnyIP() bool {
 	return false
 }
 
+func (c *cloudflare) Token() (token string) {
+	return ""
+}
+
 // FetchInfo obtains information on the public IP address of the machine,
 // and returns an error if the `ip` argument is set since the Cloudflare API
 // can only be used to provide details about the current machine public IP.