Add support for emails with mu4e

[Gavinok]

Allow lsp to start when composing emails with mu4e

[jcs090218]

There are three variables control the LSP services.

1. project root must be defined
2. lsp-grammarly-active-modes
3. lsp-grammarly-patterns

I think once these requirements are met, you should able to run lsp-grammarly in those buffers. Hope the information helps! ❤️

Edit: I was wrong about the Pt. 1. Please ignore that!

[jcs090218]

Another choice is to use flycheck-grammarly or flymake-grammarly (flycheck vs flymake), and these packages aren't LSP base so those requirements can be ignored.

[Gavinok]

Thanks!