[BW]: fixes to found bugs

- defined vw_hive_posts to simplify queries and eliminate joins at query side
- fixed fatal bug in special characters escaping leading to modification of post body, title etc
- fixed bug in querying for root_title in condnser_api/tags_api get_comment_discussions_by method family
- fixed bug in querying for post url
- eliminated unneeded fields in _condenser_post_object causing returning not needed additional data
- tags_api group enabled in 5M smokest