This PR adds a new `SchedulePublish` config type on our schedulePublish
configuration in versions from being just boolean.
Two new options are supported:
- `timeFormat` which controls the formatting of the time slots, allowing
users to change from a 12-hour clock to a 24-hour clock (default to 12
hour)
- `timeIntervals` which controls the generated time slots (default 5)
Example configuration:
```
versions: {
drafts: {
schedulePublish: {
timeFormat: 'HH:mm',
timeIntervals: 5,
},
},
},
```
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