* Use a domain data cache to reduce the number of calls per epoch
* fix fakevalidator
* Refactor to use a feature flag, use proto.clone, move interceptor to its own file
* gofmt
* fix comment
* tune cache slightly
* log if error on domain data
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>