add support for Lsp codelens (#266)

Support for LSP code lenses

Before LSP code lenses [1] where code lenses were highlighted with the
default color which has been changed to make it less visually intrusive,
like other UI related elements, i.e. messages of linters.

[1]: https://neovim.io/doc/user/lsp.html#lsp-highlight-codelens

GH-266


Co-authored-by: Arctic Ice Studio <development@arcticicestudio.com>

colors/nord.vim

@@ -574,6 +574,7 @@ call s:hi("CocHintSign" , s:nord10_gui, "", s:nord10_term, "", "", "")
 
 " Neovim LSP
 " > neovim/nvim-lspconfig
+call s:hi("LspCodeLens", s:nord3_gui_bright, "", s:nord3_term, "", "", "")
 call s:hi("LspDiagnosticsDefaultWarning", s:nord13_gui, "", s:nord13_term, "", "", "")
 call s:hi("LspDiagnosticsDefaultError" , s:nord11_gui, "", s:nord11_term, "", "", "")
 call s:hi("LspDiagnosticsDefaultInformation" , s:nord8_gui, "", s:nord8_term, "", "", "")