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/ICoordinator.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 
 namespace NadekoBot.Services
 {
@@ -10,6 +11,7 @@ namespace NadekoBot.Services
         bool RestartShard(int shardId);
         IList<ShardStatus> GetAllShardStatuses();
         int GetGuildCount();
+        Task Reload();
     }
     
     public class ShardStatus

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 () =>

src/NadekoBot/Services/Impl/SingleProcessCoordinator.cs

@@ -64,5 +64,10 @@ namespace NadekoBot.Services
         {
             return _client.Guilds.Count;
         }
+
+        public Task Reload()
+        {
+            return Task.CompletedTask;
+        }
     }
 }