[Schedule] Centralized date formatting service

[markus-moser]

I created a similar issue also for the version view: #356

We should ensure that we have the same date formats everywhere and put the date/time/number formatting to centralized services which are re-used everywhere.

Related to #348

[Corepex]

I already started with that.
https://github.com/pimcore/studio-ui-bundle/blob/1.x/assets/js/src/core/app/config/date-time.tsx

There would be the place to configure everything.

BUT: We should question us if its really necessary to have a date / time formatted since this is already handled by i18n.
See:

studio-ui-bundle/assets/js/src/core/components/formatted-date/formatted-date.tsx

Lines 23 to 27 in 1bb82a2

	const formattedDate = i18n.format(
	new Date(props.timestamp * 1000),
	'datetime',
	i18n.language
	)

or

studio-ui-bundle/assets/js/src/core/components/formatted-time/formatted-time.tsx

Lines 23 to 30 in 1bb82a2

	const formattedDate = i18n.format(
	new Date(props.timestamp * 1000),
	'datetime',
	i18n.language,
	{
	timeStyle: 'short'
	}
	)

[markus-moser]

@Corepex Please create centralized utils as wrapper of I18N to format dates