Add combined swing mode for horizontal and vertical support

[Pr0mises]

This adds the possibility to change the horizontal and vertical swing mode of the AC

[anszom]

I'm not sure if this is a good idea. The "combined" property only allows HA to "see" the last attribute that it has changed, but not the other one (for example: if you set "Vertical 2", you can't check what is the horizontal swing mode).

• the "right solution" would be to pester HA maintainers to add the other swing mode attribute upstream.
• as a theoretical alternative, we could have a combined Horizontal x Vertical attribute with 8*9=72 possible values. This - obviously - would not be very practical.
• the current solution: we expose the other swing mode on MQTT, although in a way which is not directly compatible with current HA.

So far the last option seems the most acceptable to me

[Pr0mises]

I was thinking about those options but that's how the thingq hacs Integration dealt with it and it wasn't confusing at all. For my part I leave the vertical swing at one position most of the time

[Pr0mises]

Good news:
https://developers.home-assistant.io/blog/2024/12/03/climate-horizontal-swing/

Horizontal swings are now supported