switch around all iconfiguration usage to ioptions

MareSynchronosServer/MareSynchronosServices/ServicesConfiguration.cs

@@ -0,0 +1,23 @@
+using MareSynchronosShared.Utils;
+using System.Text;
+
+namespace MareSynchronosServices;
+
+public class ServicesConfiguration : MareConfigurationBase
+{
+    public string DiscordBotToken { get; set; } = string.Empty;
+    public bool PurgeUnusedAccounts { get; set; } = false;
+    public int PurgeUnusedAccountsPeriodInDays { get; set; } = 14;
+    public int MaxExistingGroupsByUser { get; set; } = 3;
+
+    public override string ToString()
+    {
+        StringBuilder sb = new();
+        sb.AppendLine(base.ToString());
+        sb.AppendLine($"{nameof(DiscordBotToken)} => {DiscordBotToken}");
+        sb.AppendLine($"{nameof(PurgeUnusedAccounts)} => {PurgeUnusedAccounts}");
+        sb.AppendLine($"{nameof(PurgeUnusedAccountsPeriodInDays)} => {PurgeUnusedAccountsPeriodInDays}");
+        sb.AppendLine($"{nameof(MaxExistingGroupsByUser)} => {MaxExistingGroupsByUser}");
+        return sb.ToString();
+    }
+}