Add support for platform-native rolling app deployments

[tcdowney]

Cloud Foundry now has beta support for rolling app deployments in the platform as an alternative to the blue-green/red-black/venerable/etc. style of "zero-downtime" cf push today.

It is still an experimental feature (first enabled by default in cf-deployment v7.6.0, but is usable via the cf v3-apply-manifest and cf v3-zdt-push commands.

Would y'all consider a PR from us (CF CAPI team) that adds experimental support for it to this resource?

[vito]

totes

[vito]

In an ideal world someone from CF would take over this resource, by the way - just like how they took over the BOSH deployment resource. We don't really have the bandwidth or expertise to maintain this in the long run.