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/Types/SessionName.sql

@@ -1,2 +0,0 @@
-CREATE TYPE [session].[SessionName]
-	FROM nvarchar(50) NOT NULL

Shogi.Database/Session/Types/SessionSurrogateKey.sql

@@ -0,0 +1,2 @@
+CREATE TYPE [session].[SessionSurrogateKey]
+	FROM CHAR(36) NOT NULL