Add Mono10g40 & Mono12g24 PixelFormats (IDS cameras)

[aphilip442]

What is the goal that you want to achieve by the request?
I would like to use some IDS cameras with Harvesters, such as the one showed here: https://fr.ids-imaging.com/store/u3-38j2xls-rev-1-2.html
Currently Harvesters fails to use them because it misses the required pixel formats (Mono10g40 & Mono12g24).
I implemented those formats following the explanations provided here: https://www.1stvision.com/cameras/IDS/IDS-manuals/en/basics-monochrome-pixel-formats.html

I will make a PR for this.

[aphilip442]

As mentioned here (https://www.1stvision.com/cameras/IDS/IDS-manuals/en/basics-monochrome-pixel-formats.html) the definitive name (so probably the associated symbolic key) might change, so an additional lookup might need to be added in the future.
If extending the official PFNC symbolics directly is a nono (?), then a mechanism to extend it would also be great.