Move modules/forms to services/forms (#15305)

Forms are dependent on models and therefore should be in services.

This PR also removes the old auth. aliasing

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

routers/user/setting/applications.go

@@ -11,9 +11,9 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
-	auth "code.gitea.io/gitea/modules/forms"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web"
+	"code.gitea.io/gitea/services/forms"
 )
 
 const (
@@ -32,7 +32,7 @@ func Applications(ctx *context.Context) {
 
 // ApplicationsPost response for add user's access token
 func ApplicationsPost(ctx *context.Context) {
-	form := web.GetForm(ctx).(*auth.NewAccessTokenForm)
+	form := web.GetForm(ctx).(*forms.NewAccessTokenForm)
 	ctx.Data["Title"] = ctx.Tr("settings")
 	ctx.Data["PageIsSettingsApplications"] = true