Add a new lazy container which can automatically retry if its initializer fails

[KyNorthstar]

If its initializer throws an error or returns nil, it should retry initialization next time. This will be useful for allowing operations to gracefully fail and trying them again once appropriate.

This could also contain a minimum retry timeout, so that expensive initializers aren't rapidly called over and over if we know they failed for something that is more likely to work later (for instance, if an initializer fails because a network call failed, or it needs another program which is still starting, etc.)