feat(util): added util function to get a fg/bg color from the active colorscheme

lua/lazyvim/util/ui.lua

@@ -139,14 +139,31 @@ function M.statuscolumn()
   return table.concat(components, "")
 end
 
+---@return {fg?:string}?
 function M.fg(name)
+  local color = M.color(name)
+  return color and { fg = color } or nil
+end
+
+---@param name string
+---@param bg? boolean
+---@return string?
+function M.color(name, bg)
   ---@type {foreground?:number}?
   ---@diagnostic disable-next-line: deprecated
   local hl = vim.api.nvim_get_hl and vim.api.nvim_get_hl(0, { name = name, link = false })
     or vim.api.nvim_get_hl_by_name(name, true)
   ---@diagnostic disable-next-line: undefined-field
-  local fg = hl and (hl.fg or hl.foreground)
+  ---@type string?
-  return fg and { fg = string.format("#%06x", fg) } or nil
+  local color = nil
+  if hl then
+    if bg then
+      color = hl.bg or hl.background
+    else
+      color = hl.fg or hl.foreground
+    end
+  end
+  return color and string.format("#%06x", color) or nil
 end
 
 M.skip_foldexpr = {} ---@type table<number,boolean>