Replace custom socket implementation with SignalR.

Replace MSAL and custom cookie auth with Microsoft.Identity.EntityFramework
Also some UI redesign to accommodate different login experience.

Shogi.Database/Session/Stored Procedures/ReadSessionsMetadata.sql

@@ -0,0 +1,21 @@
+CREATE PROCEDURE [session].[ReadSessionsMetadata]
+	@PlayerId [dbo].[AspNetUsersId]
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+	-- Read all sessions, in this order:
+	--	1. sessions created by the logged-in user
+	--	2. any other sessions the logged-in user participates in
+	--	3. all other sessions
+	SELECT
+		Id, Player1Id, Player2Id, [Session].CreatedDate,
+		case 
+			when Player1Id = @PlayerId then 0 
+			when Player2Id = @PlayerId then 1
+			else 2
+		end as OrderBy
+	FROM [session].[Session]
+	Order By OrderBy ASC, CreatedDate DESC
+
+END