Should we move common attribute documents from the spec repo to this repo?

[joaopgrassi]

There's two documents in the spec repo that are relevant to semantic conventions:

• Attribute naming
• Attribute requirement level

Should we consider moving those to the semantic conventions repo? I personally think they make more sense here, particularly the requirement level one.

I can work on moving them here, I just want to see what the community thinks

[mx-psi]

The 'Attribute requirement' doc is specific to semantic conventions and IMO it should definitely be on this repository, but the 'Attribute naming; doc feels like a more general document that also applies to e.g. the design of Collector/SDK processors that add attributes or the development of internal-facing conventions, and thus I would leave that one on the specification repository.