[Feature]: Double Slope Stairs

[ChiedoIssei]

Describe the feature

Hi.
I've been building a ship module and utilising this mod and I've missing a shape.

There's one block that almost perfectly fits the concept I need: the Framed Large Double Corner Slope Panel, but it has one drawback: the front side uses the texture from the back. Therefore, I'd like to offer these options for a stair block with two textures.

For version 1.21+

[XFactHD]

These seem rather niche to me. I'll think about adding the variant using a "standard" slope (i.e. the top two) but I'm gonna say no to the slope slab/panel variants (i.e. the bottom two).

However, 1.21.1 is in limited maintenance and won't receive any new blocks or major features anymore, so these would only be added to 26.1.