[feat] color-mix css support

### Is your feature request related to a problem? Please describe.

CSS should parse [color-mix](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/color-mix) properly.

### Please accept these terms

- [x] I have searched the [existing issues](https://github.com/NativeScript/NativeScript/issues) as well as [StackOverflow](https://stackoverflow.com/questions/tagged/nativescript) and this has not been posted before
- [x] I agree to follow this project's [Code of Conduct](https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#coc)

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