LPS-31965 Support order by in Asset Search --> PLEASE read description

Brian, we are not sure about the pattern in BaseIndexer when using the "asset_" prefix, but we found several isssues that we are fixing when doing it in this way:
- if we use the field "title" it won't work since that one contains the localized title. We are working on supporting ordering by localized title, but that requieres more changes. Using "asset_title" now will support ordering the title in the default locale.
- createDate and modifiedDate are already indexed for auditedModels, but we are indexing them here to make sure we index for all the assets even if they are not auditedModels, because if one asset is missing, then lucen doesn't order anything.