chore: remove cache options

Cache was not working correctly, added more complexity and actually made response times slower. Because of this, I'm removing all cache options until we figure out a better solution.

Resolves https://kolaente.dev/vikunja/api/issues/1496
Resolves https://kolaente.dev/vikunja/api/issues/907

pkg/files/db.go

@@ -17,7 +17,6 @@
 package files
 
 import (
-	"code.vikunja.io/api/pkg/config"
 	"code.vikunja.io/api/pkg/db"
 	"code.vikunja.io/api/pkg/log"
 	"xorm.io/xorm"
@@ -33,11 +32,6 @@ func SetEngine() (err error) {
 		return
 	}
 
-	// Cache
-	if config.CacheEnabled.GetBool() && config.CacheType.GetString() == "redis" {
-		db.RegisterTableStructsForCache(GetTables())
-	}
-
 	return nil
 }