[Matter] Add support for NO₂

[pierre-gilles]

Description

Add support for NO₂ sensors in the Matter integration

[mutmut]

same scale as COV:

[pierre-gilles]

Hello!

I added this feature in this PR: Matter: Add No2 index sensor by Pierre-Gilles · Pull Request #2540 · GladysAssistant/Gladys · GitHub

To be tested on this Docker image (available in 10 minutes)

gladysassistant/gladys:add-matter-no2-index