feat: make DMNStateDiff.pose_ban_height double optional (#29)

* feat: support of double optional for DMNStateDiff.pose_ban_height field

* refactor: simplify wrapping "pose_ban_height" in option

* refactor: add deserialize_u32_2opt

* doc: add description for DMNStateDiffIntermediate.pose_ban_height

* refactor: use double option for each pose_ban_height field

Author: shotonoff