feat: config setting to default show/hide private info

PluralKit.Core/Database/Migrations/23.sql

@@ -0,0 +1,6 @@
+-- schema version 23
+-- show/hide private information when looked up by linked accounts
+
+alter table system_config add column show_private_info bool default true;
+
+update info set schema_version = 23;

PluralKit.Core/Database/Utils/DatabaseMigrator.cs

@@ -9,7 +9,7 @@ namespace PluralKit.Core;
 internal class DatabaseMigrator
 {
     private const string RootPath = "PluralKit.Core.Database"; // "resource path" root for SQL files
-    private const int TargetSchemaVersion = 22;
+    private const int TargetSchemaVersion = 23;
     private readonly ILogger _logger;
 
     public DatabaseMigrator(ILogger logger)