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

See [this issue](https://github.com/gradle/foojay-toolchains/issues/47) and [related PR](https://github.com/gradle/foojay-toolchains/pull/62).

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.