chore: lsp diagnostics setup

lua/nvim-tree/diagnostics.lua

@@ -88,6 +88,9 @@ local function from_coc()
 end
 
 function M.update()
+  if not M.enable then
+    return
+  end
   local buffer_severity
   if vim.g.coc_service_initialized == 1 then
     buffer_severity = from_coc()
@@ -116,4 +119,8 @@ function M.update()
   end
 end
 
+function M.setup(opts)
+  M.enable = opts.lsp_diagnostics
+end
+
 return M