Polish & move new modeline into :ui modeline

Removes modeline library out of core-ui and contains them in :ui
doom-modeline and :ui modeline.

:ui modeline will eventually replace :ui doom-modeline, but is still
considered experimental. This update provides makes it much more stable
and closer to being feature complete.

modules/ui/modeline/packages.el

@@ -0,0 +1,20 @@
+;; -*- no-byte-compile: t; -*-
+;;; ui/modeline/packages.el
+
+;;; These are the invisible dependencies
+;; Required
+;;(require 'evil)
+;;(require 'projectile)
+;;(require 'all-the-icons)
+
+;; Optional
+;;(require 'flycheck)
+;;(require 'iedit)
+;;(require 'evil-multiedit)
+
+(package! anzu)
+
+(when (featurep! :feature evil)
+  (package! evil-anzu))
+
+;; TODO (package! shrink-path)