feat: split emulator into core without deps and a higher level wrapper with grpc helpers - #1264

feat: split emulator into core without deps and a higher level wrapper with grpc helpers#1264

gcf-merge-on-green[bot] merged 4 commits into

googleapis:maingoogleapis/java-bigtable:mainfrom

igorbernstein2:split-emulatorigorbernstein2/java-bigtable:split-emulatorCopy head branch name to clipboard