Draft: Resolve "Epic: Prepare taxonomy-lib for the 24.07 release."

Closes #27

Merging:

• Add new height attribute HHT and adapt the function is_valid_height_tag() to handle HHT correctly (!28 (merged)).
• Function get_number_of_stories() needs to translate the total height of the building (given as HHT) into number of stories if these are not given as H, HBET or HEX (!29 (merged)).

\approve @laurens @gislars

\fyi @tara