Use a less visible style for inlay hints

[quyykk]

Inlay hints look like this currently (Macchiato, but the others have the same problem)

They really stick out. I would like to see them less visible, maybe something like this:

Thoughts?

[nekowinston]

Yeah, they stand out pretty badly. I'll try a different look for them with the next release.

I'll probably take a look at JetBrains again and make it look similar, like planned in #53

[louisjdcharles]

I have this exact problem, the foreground colour is way too bright.