Support crystalline for Crystal

[restitux]

It seems crystalline has replaced scry. The scry repo README now links to crystalline (see https://github.com/elbywan/crystalline).

It did some basic testing by renaming the crystalline binary to scry. Most basic features I tried to use seemed to work correctly.

[yyoncho]

willing to provide a PR?

[restitux]

Sure, would you suggest dropping support for scry or supporting both?

[restitux]

PR assuming we want to drop scry: #4007

[xendk]

I'll second this.

The current workaround is (setq lsp-clients-crystal-executable '("crystalline" "--stdio")), which works, but would be nice if it just worked out of the box.