PLA-267 move JsonFormat to extension
PLA-267 rename JsonFormatTraversingState to JsonFormatBuilder
PLA-267 add support for tables
PLA-267 add missing file
PLA-267 handle Table of Contents
PLA-267 handle paragraphs
PLA-267 move api endpoint  to JsonFormatApiController
PLA-267 use registerClass method in JsonFormat.setup
PLA-267 support image figures