Pull-based Queue data structure

[lukehoban]

We may want to consider a pull-based Queue data-structure. This will be dependent on having a container-based compute option where long running code can be used to poll the Queue. See additional notes related to Queue's in https://github.com/pulumi/lumi-platform/issues/8.

[joeduffy]

Especially now that we have containers, I really want this.

[joeduffy]

Although, for it to make sense end-to-end, we will need something like https://github.com/pulumi/pulumi-cloud/issues/101.

[lukehoban]

Note that this will already make sense with our function-based container support, as that enables long running compute that can directly capture Pulumi framework objects.

But for image or build based services, we’ll need to address #101 before any Pulumi cloud concepts can be passed between Pulumi code and arbitrary other code running in containers.