Add support support command like eslint.executeAutofix to start coc-diagnostic manyally

[utrumo]

Describe the bug
Now coc-nvim support one formatter at some time (neoclide/coc.nvim#2269).
I use "stylelintplus.autoFixOnSave: true" and with this variant coc-diagnostico wants start automatic on save.
It would not be bad to be able to run the coc-diagnostic formatter manually on save from .vimrc
To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS:

Log:

[iamcco]

Sorry I don't understand what does it means.

[Freed-Wu]

wants start automatic on save.

You means format code on save? It should be related to coc.nvim, not this plugin.