[Pulumi Copilot] Support for invoking Cloud CLIs (aws, kubectl, az, gcloud)

[lukehoban]

Pulumi Cloud stores a wide range of data associated with infrastructure managed by Pulumi. And yet, there is an enormous amount of additional useful information and actions that can be taken in Pulumi Copilot on cloud infrastructure via the Cloud provider data planes directly, using their REST APIs and/or CLIs.

A few scenarios enabled by these:

1. Access to operational metrics for resources
2. Access to operational logs for resources
3. The ability to make operational changes to infrastructure (outside of IaC)
4. Access to details of resources not (yet) managed by Pulumi

We've recently prototyped the first of these: