Added .coordreload which will reload coord.yml when using NadekoBot.Coordinator

- bots with more than 1 shard will now use redis strings provider

src/NadekoBot/Services/Impl/RemoteGrpcCoordinator.cs

@@ -79,6 +79,11 @@ namespace NadekoBot.Services
             return res.Statuses.Sum(x => x.GuildCount);
         }
 
+        public async Task Reload()
+        {
+            await _coordClient.ReloadAsync(new());
+        }
+
         public Task OnReadyAsync()
         {
             Task.Run(async () =>