* Move utils packages that are required for gitops engine under engine/pkg/utils package.
Following changes were implemented:
* util/health package is split into two parts: resource health assessement & resource health assessement and moved into engine/pkg/utils
* utils packages moved: Closer and Close method of util package moved into engine/pkg/utils/io package
* packages diff, errors, exec, json, kube and tracing moved into engine/pkg/utils
* Move single cluster caching into engine/kube/cache package
* move sync functionality to engine/kube/sync package
* remove dependency on metrics package from engine/pkg/utils/kube/cache
* move annotation label definitions into engine/pkg/utils/kube/sync
* make sure engine/pkg has no dependencies on other argo-cd packages
* allow importing engine as a go module
* implement a high-level interface that might be consumed by flux
* fix deadlock caused by cluster cache event handler
* ClusterCache should return error if requested group kind not found
* remove obsolete tests
* apply reviewer notes
* Add "skip-rbac-setup" flag to "cluster add" command
"InstallClusterManagerRBAC" method of the clusterauth package
is somewhat opinionated about rolebindings and role definitions
for "argocd-manager" SA. Sometimes it is desirable however to manually
pre-configure such bindings and/or modify them in order to comply
with existing infrastructure requirements.
This commit introduces a new option "--skip-rbac-setup" which allows operator
to skip the aforementioned "InstallClusterManagerRBAC" method call.
* Modified --skip-rbac-setup into --service-account flag
* use reference instead of hardoded SA name
