[IntelliSense] Show warning when extension fails to load config

[kyldvs]

It would be nice if the tailwind intellisense extension could show a warning when it fails to load the tailwind.config.js file for whatever reason. It would have saved me about a half hour of debugging.

I had removed a dependency from my package.json which caused the config to stop resolving a plugin, clearly my fault, but I think the extension could have sped up my debugging with a friendly error message (I did eventually find the error message in extension logs in VS code, but that wasn't super discoverable). A toast in the bottom right like a lot of other extension do would be preferable to me.