Support customDatePattern and customDateTimePattern as global config options

[joelittlejohn]

We can currently turn on default formatting with formatDates/formatDateTimes and also customize the pattern by adding customPattern to an individual field inside the schema. It would be good to be able to set a custom pattern globally (via a config option).

[joelittlejohn]

This will also satisfy requests like #698

[sbyrx]

@joelittlejohn Is there a reason why customTimePattern isn't supported?

I'm using <timeType>java.time.LocalTime</timeType>, and would like to be able to specify a pattern and have my LocalTime fields be annotated with @JsonFormat.

I noticed that Jackson2Annotator only annotates date and date-time.

[joelittlejohn]

@sbyron15 I don't see any reason that we shouldn't fix that for you. I'll take a look.

[sbyrx]

@joelittlejohn I went ahead and added support myself. Please see #740

Thanks!