[OneBot] Implemented set_qq_avatar and set_group_portrait

Lagrange.OneBot/Core/Entity/Action/OneBotSetGroupPortrait.cs

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+using System.Text.Json.Serialization;
+
+namespace Lagrange.OneBot.Core.Entity.Action;
+
+[Serializable]
+public class OneBotSetGroupPortrait
+{
+    [JsonPropertyName("group_id")] public uint GroupId { get; set; }
+
+    [JsonPropertyName("file")] public string File { get; set; } = string.Empty;
+}

Lagrange.OneBot/Core/Operation/Generic/SetGroupPortraitOperation.cs

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+using System.Text.Json.Nodes;
+using Lagrange.Core;
+using Lagrange.Core.Common.Interface.Api;
+using Lagrange.Core.Message.Entity;
+using Lagrange.OneBot.Core.Entity.Action;
+using Lagrange.OneBot.Message.Entity;
+
+namespace Lagrange.OneBot.Core.Operation.Generic;
+
+[Operation("set_qq_avatar")]
+public class SetQQAvatar : IOperation
+{
+    public async Task<OneBotResult> HandleOperation(BotContext context, JsonNode? payload)
+    {
+        if (payload?["file"]?.ToString() is { } portrait)
+        {
+            var image = CommonResolver.ResolveStream(portrait);
+            if (image == null) throw new Exception();
+
+            var imageEntity = new ImageEntity(image);
+            bool result = await context.SetAvatar(imageEntity);
+            return new OneBotResult(null, result ? 0 : 1, "");
+        }
+
+        throw new Exception();
+    }
+}

Lagrange.OneBot/Core/Operation/Group/SetGroupPortraitOperation.cs

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+using System.Text.Json;
+using System.Text.Json.Nodes;
+using Lagrange.Core;
+using Lagrange.Core.Common.Interface.Api;
+using Lagrange.Core.Message.Entity;
+using Lagrange.OneBot.Core.Entity.Action;
+using Lagrange.OneBot.Message.Entity;
+
+namespace Lagrange.OneBot.Core.Operation.Group;
+
+[Operation("set_group_portrait")]
+public class SetGroupPortraitOperation : IOperation
+{
+    public async Task<OneBotResult> HandleOperation(BotContext context, JsonNode? payload)
+    {
+        if (payload.Deserialize<OneBotSetGroupPortrait>() is { } portrait)
+        {
+            var image = CommonResolver.ResolveStream(portrait.File);
+            if (image == null) throw new Exception();
+
+            var imageEntity = new ImageEntity(image);
+            bool result = await context.GroupSetAvatar(portrait.GroupId, imageEntity);
+            return new OneBotResult(null, result ? 0 : 1, "");
+        }
+
+        throw new Exception();
+    }
+}