lint: Try to suggest fixes where possible

It would be great if we could have configlet "detect" typos on the users part. As an example, suppose the `config.json` contains a misspelled tag: `runtime/jvn`. We could then try to detect this and suggest:

> Unknown tag 'runtime/jvn'. Did you mean 'runtime/jvm'?

Start by locating the config.json validation or lint entry point in configlet and trace how unknown tags are reported. Done means a misspelled tag such as runtime/jvn is detected and the output suggests runtime/jvm, with behavior covered by the project's existing checks if available.

Written by the indexing model from the issue text.