Implement gRPC on client and server

Pending Testing

AobaServer/Utils/Extensions.cs

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+using MongoDB.Bson;
+
+namespace AobaServer.Utils;
+
+public static class Extensions
+{
+	public static ObjectId ToObjectId(this string? value)
+	{
+		if(value == null)
+			return ObjectId.Empty;
+		if(ObjectId.TryParse(value, out ObjectId result))
+			return result;
+		return ObjectId.Empty;
+	}
+}

AobaServer/Utils/ProtoExtensions.cs

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+using AobaCore.Models;
+using Aoba.RPC;
+
+using MongoDB.Bson;
+
+namespace AobaServer.Utils;
+
+public static class ProtoExtensions
+{
+	public static ListResponse ToResponse(this PagedResult<Media> result)
+	{
+		var res = new ListResponse()
+		{
+			Pagination = result.ToPagination(),
+		};
+		res.Items.AddRange(result.Items.Select(i => i.ToMediaModel()));
+		return res;
+	}
+
+	public static Pagination ToPagination<T>(this PagedResult<T> result)
+	{
+		return new Pagination()
+		{
+			Page = result.Page,
+			PageSize = result.PageSize,
+			TotalItems = result.TotalItems,
+			TotalPages = result.TotalPages,
+			Query = result.Query,
+		};
+	}
+
+	public static MediaResponse ToResponse(this Media? media)
+	{
+		if(media == null) 
+			return new MediaResponse() { Empty = new Empty() };
+		return new MediaResponse()
+		{
+			Value = media.ToMediaModel()
+		};
+	}
+
+	public static MediaModel ToMediaModel(this Media media)
+	{
+		return new MediaModel()
+		{
+			Ext = media.Ext,
+			FileName = media.Filename,
+			Id = media.Id.ToId(),
+			MediaId = media.MediaId.ToId(),
+			MediaType = (Aoba.RPC.MediaType)media.MediaType,
+			Owner = media.Owner.ToId(),
+			ViewCount = media.ViewCount,
+		};
+	}
+
+	public static Id ToId(this ObjectId id)
+	{
+		return new Id() { Value = id.ToString() };
+	}
+
+	public static ObjectId ToObjectId(this Id id) 
+	{
+		return id.Value.ToObjectId();
+	}
+}