Save initial signup information for users to aid in spam prevention (#31852)

This will allow instance admins to view signup pattern patterns for
public instances. It is modelled after discourse, mastodon, and
MediaWiki's approaches.

Note: This has privacy implications, but as the above-stated open-source
projects take this approach, especially MediaWiki, which I have no doubt
looked into this thoroughly, it is likely okay for us, too. However, I
would be appreciative of any feedback on how this could be improved.

---------

Co-authored-by: Giteabot <teabot@gitea.io>

routers/install/install.go

@@ -554,7 +554,7 @@ func SubmitInstall(ctx *context.Context) {
 			IsActive:     optional.Some(true),
 		}
 
-		if err = user_model.CreateUser(ctx, u, overwriteDefault); err != nil {
+		if err = user_model.CreateUser(ctx, u, &user_model.Meta{}, overwriteDefault); err != nil {
 			if !user_model.IsErrUserAlreadyExist(err) {
 				setting.InstallLock = false
 				ctx.Data["Err_AdminName"] = true