[TASK] Require bower and have node build scripts

In preperation of a scss linter and typescript linter
we require bower as root dev dependency and register
some happy little scripts.

Change-Id: I425fd848a4012065fc7d955be0ae961f0f2ee8c4
Resolves: #81410
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/53003


Reviewed-by: Markus Sommer <markussom@posteo.de>
Tested-by: Markus Sommer <markussom@posteo.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>