Add Remaining HTML5 Date Elements month, week, time, datetime-local

In #675348-64: META: Support HTML5 form input elements @webchick clearly outlined the HTML5 elements which are still missing in Drupal 8. function datetime_element_info() has datetime in datetime/datetime.module:

Theme theme_date seems to support HTML5 types of 'date', 'datetime', 'datetime-local', and 'time', but 'datetime-local' isn't in system_element_info() .

All of these HTML5 elements could use support:

month - #1496682: Add new HTML5 FAPI Element : month
week - #1496686: Add new HTML5 FAPI Element : week
time - #1496708: Add new HTML5 FAPI Element : time
datetime-local - #1496652: Add new HTML5 FAPI Element : datetime-local

Also see [#1183606]
And the big date patch here #501428: Date and time field type in core