display multiple suggestions when a config has an unknown feature

[romainmenke]

fixes : #1061

We use a Levenshtein distance to find the most similar real feature but we also use the npm package names to find entries. This makes it possible to encounter this edge case :

• user enters postcss-oklab-function
• the package name is @csstools/postcss-oklab-function
• the feature name is oklab-function
• most similar result is postcss-lab-function

This is the most similar result because only two characters need to be altered.
Whereas the right result requires at least 8 changes.

user entry:
          postcss-oklab-function

candidates:
            postcss-lab-function
@csstools/postcss-oklab-function
                  oklab-function

This can not be fixed in a general, yet simple way.

---

Instead of showing only the top hit we will now show the 3 most likely features.

This makes it possible for users to pick the correct option even when a Levenshtein distance gives an unexpected result.

[postcss-preset-env]: Unknown feature: "postcss-oklab-function", did you mean one of: "lab-function", "oklab-function", "image-set-function"