feat: support (Neo)Vim by coc.nvim

[Freed-Wu]

https://www.npmjs.com/package/coc-alex

Refer: https://github.com/valentjn/vscode-ltex/blob/3d0cb8cd9b4d0dc8ef6c08a4f376767820678cf6/src/extension.ts#L8-L14

Difference is vscode-ltex/coc-ltex uses a customized python script https://github.com/valentjn/vscode-ltex/blob/3d0cb8cd9b4d0dc8ef6c08a4f376767820678cf6/tools/patchForTarget.py to patch code we use c language macro preprocessor cpp

Can you add me to collaborators to maintain the support of coc.nvim? And I want to add your npm account to collaborators of npm package of coc-alex due to most code comes from you. TIA!