Add the ability to set label test

[Shatur]

completion-nvim have g:completion_customize_lsp_label. It allows to use icons for labels. For example:

let g:completion_customize_lsp_label = {
      \ 'Function': '',
      \ 'Reference': '',
      \ 'Keyword': '',
      \ 'Variable': '',
      \ 'Folder': '',
      \ 'Snippet': '',
      \ 'Operator': '',
      \ 'Module': '',
      \ 'Text': '',
      \ 'Class': '',
      \ 'Interface': '',
      \}

Is it possible to respect this setting?

[steelsojka]

@Shatur95 done. The keys for these would be the original kind. Buffer and Buffers.

[Shatur]

Thanks!