docs: add css layer names adr

[joshblack]

View Rendered ADR

Adds an ADR in order to define our CSS Layers and the order that they should be applied in. I wanted to take a stab at defining this for us as we start moving more into CSS Layers world. Defining the layers and their order should help address issues like: https://github.com/github/primer/issues/5181 since we will have a deterministic order in which styles are applied.

This was a quick draft so let me know if you have any questions or feedback! In particular, would love to see any resources you all might have that talk about this in other systems 👀 I linked a couple but I'm sure there are more out there.

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size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	96.22 KB (0%)
packages/react/dist/browser.umd.js	96.48 KB (0%)

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