Split AuthService/Server

some refactoring
fix some stuff
add http context accessor
configure metrics as well
commit 713d054ccb965f7adb8eafa6e3fb52853a1e6dd2 (partial, Docker only)

MareSynchronosServer/MareSynchronosStaticFilesServer/Services/FileCleanupService.cs

@@ -4,6 +4,7 @@ using MareSynchronosShared.Data;
 using MareSynchronosShared.Metrics;
 using MareSynchronosShared.Models;
 using MareSynchronosShared.Services;
+using MareSynchronosShared.Utils.Configuration;
 using MareSynchronosStaticFilesServer.Utils;
 using MessagePack.Formatters;
 using Microsoft.EntityFrameworkCore;