hook up patch subscribtion api in ShardedSubscribableStorage

Summary: This only supports concrete path now. Added support for patch subscription in networkHandler. I did not expose this to NSDB since we should expose the extended subs version instead. In the mean time, we should still need this as building blocks for extended subs

Reviewed By: peygar

Differential Revision: D60695878

fbshipit-source-id: 0d172dbf53453dbb5172dd14a6aee37e370dea9a

fboss/fsdb/oper/NaivePeriodicSubscribableStorage.h

@@ -94,6 +94,9 @@ class NaivePeriodicSubscribableStorage
   using Base::subscribe_delta_extended;
   using Base::subscribe_encoded;
   using Base::subscribe_encoded_extended;
+#ifdef ENABLE_PATCH_APIS
+  using Base::subscribe_patch;
+#endif
 
   template <typename T>
   Result<T> get_impl(PathIter begin, PathIter end) const {

fboss/thrift_cow/storage/BUCK

@@ -7,6 +7,7 @@ cpp_library(
     headers = [
         "Storage.h",
     ],
+    propagated_pp_flags = ["-DENABLE_PATCH_APIS"],
     exported_deps = [
         "//fboss/fsdb/if:fsdb_oper-cpp2-types",
         "//fboss/thrift_cow:patch-cpp2-types",