feat(packets): add party stat packet

feat(packets): add many new packets

fix(packets): add header for st sub packet

feat(packets): add support for st buff vnums with levels

fix(packets): make st packet buff vnums a read only list instead of list

fix(packets): make eq packet size optional

fix(packets): make correct inner separator in eq sub packet

feat(packets): add entities and maps packets

fix(packets): make correct fields nullable

feat: split packets definitions into separate assembly