Add missing parts of openAPI doc schemas

[flauschzelle]

There are some parts missing in the openapi documentation schemas, leading to error messages on the documentation page.

So far, I've found the following things to be missing:

• all the ..._examples are just empty dicts, they should be filled with actual example data (for some reason, some (but not all) examples are shown on the documentation page anyway, not sure what they're generated from)
• evse_schema has a field that references StatusSchedule, but there's no schema for that
• the example for RegularHours shown on the documentation page has this instead of actual examples:

{
  "weekday": 1,
  "period_begin": "/regex/",
  "period_end": "/regex/"
}