add composes for noUnknownProperty.

[denbezrukov]

The current implementation of noUnknownProperty raises an error for the composes property, which is a part of the CSS Modules syntax (refer to CSS Modules Documentation). We need to modify the implementation so that it does not raise an error for the composes property if the css_modules option is enabled.

.className {
  color: green;
  background: red;
}

.otherClassName {
  composes: className;
  color: yellow;
}

[denbezrukov]

@chansuke What do you think?
Could it be interesting for you?🙈

[chansuke]

@denbezrukov
That sounds like a good suggestion and i'd like to handle this:)