Add timeout option for uptimerobot

[gfr]

Uptimerobot allows to specify a timeout for certain types of monitors (HTTP, keyword, port monitor types). This property (timeout) is currently not available in IngressMonitorController and should be added in a future version.

Details are available in the official uptimerobot docs: https://uptimerobot.com/api/

[github-actions]

This issue is stale because it has been open for 60 days with no activity.

[gfr]

The feature is still needed, please don't close it!