Feature Request: Wide-gamut colors support (Display P3, BT.2020)

[Kamillaova]

Use Case: Previewing wide-gamut colors (e.g. for textDocument/documentColor)

I'm not familiar with LSP, but I think this could be implemented by adding a gamut: 'srgb' | 'display-p3' | 'rec2020' field to the Color object and sending to the server, upon startup, which color gamut the client can display.

[Mycatty]

Thanks