Consider adding standard JSOG ObjectIdGenerator

[cowtowncoder]

(see #622 also)

With 2.5, Jackson will allow full support for JSOG.
Given that there is a nice implementation of ObjectIdGenerator and other necessary classes in https://github.com/jsog/jsog-jackson would it make sense to include this as part of core jackson-databind?
(and/or if possible/feasible, right in jackson-annotations, next to other implementations -- not 100% sure that is feasible tho).

One possibility would be to release 2.5 first, and then if it makes sense, bundle this in 2.6.
That might be the safest route, and also allow for quick fixes (if need be) for the JSOG handler implementation.

[stickfigure]

I would be happy either way. If it means delaying the RC of 2.5 at all, I would push it off to 2.6.

[cowtowncoder]

Perhaps we should add this in 2.6, to make sure things work as expected. I'll keep this open.

[cowtowncoder]

Not sure this is desired any more. If it is, please re-open or add comment; could be considered for 3.0.