bug#38807: [Feature request]: Support lisp workers like web workers.

[HaiJun Zhang]

在 2020年1月3日 +0800 PM2:02，Eli Zaretskii <eliz@gnu.org>，写道：

There are ways of communications (e.g., you can call any Emacs
function), but if more is needed, we can add that. Some design is
necessary, though, to identify what else is needed and why.

There is discussion related with this. https://emacs-china.org/t/lsp-mode/11238/36