Add the yr-sensor to the met.no platform

Now that the Yr component has been removed I think it’s time to discuss the implementation of the sensors in the met.no platform.
I am aware of the discussion in https://github.com/home-assistant/core/pull/30115 but that was before the entire Yr platform was removed from HA.

I currently have about 50 sensor.yr_* entities which I use in a lot of automations and templates that will stop working when I upgrade to the long awaited 0.115…

After a quick chat on Discord, it is clear that the reviewers did not want to add the sensors to this integration.
However there is a new custom_component being created that will replicate the functionality of the old Yr sensor:

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