Create a java lite flavor of channelz (#163)

Author: jdcormie

BUILD.bazel

@@ -117,6 +117,12 @@ java_proto_library(
     deps = [":channelz_proto"],
 )
 
+java_lite_proto_library(
+    name = "channelz_java_proto_lite",
+    visibility = ["//visibility:public"],
+    deps = [":channelz_proto"],
+)
+
 proto_library(
     name = "health_proto",
     srcs = ["grpc/health/v1/health.proto"],