cluster_resolver: move balancer config types into cluster_resolver package and unexport#4607

Merged

menghanl merged 1 commit intogrpc:masterfrom menghanl:config_builder_unexport

Jul 22, 2021

+371-450

Commits on Jul 21, 2021

[config_builder_unexport] move balancer config package into cluster_resolver and unexport
menghanl
committed