Take into account the pre-computed figure types when generating figure blocks

Currently, the figure type is recomputed using FigureTypeRecognizer every time a figure block is rendered.

A data-xwiki-rendering-figure-type parameter can now be defined by XS 14.6+ or some other extensions (e.g., number content app 1.6+).

When this parameter exists, it should be used instead of recomputing because:

• it's faster
• the user can define explicitly the type of a figure. If the defined type contracts FigureTypeRecogniser the rendered latex is not consistent with the wiki page