Adds bootstrap/sync/issuer plugin (#390)

* adds bootstrap plugin

* check sync state in sync-integration test

* adds synced and bootstrapping plugin to integration test networks

* fix comments

* re-introduce go.mod into integration test dir

* adds desynchronization monitor

* adds shutdown priority for bootstrap plugin bk. worker

* give the dog some pedigree

* adds anchor point cleanup interval

* fix review dog comments

* go mod tidy powered by Marie Kondo