Add a retry mechanism for communicating with the Foojay back-end

[jbartok]

See this issue and related PR.

It would be good if communication failures with the Foojay back-end wouldn't immediately make the plugin's resolving fail. It would be good if the plugin would retry a couple of times before giving up. I'm thinking 2-3 retries with increasing delays, not too long though, the Gradle build might have other toolchain resolvers configured, at some point we need to hand things over to those.