Deployments feature

[dboreham]

• [x] Allow creation of immutable deployments -- a deployed instance of a stack with a particular configuration and properties (unlike fixturenet-based stack deploys which are to a first approximation all the same).
• [ ] Support lifecycle management for deployments, e.g. initialization with chain-chunker-sourced data set prior to bringing online for service.
• [x] Support per-stack initialization programming and reporting.

[dboreham]

Depends on: https://github.com/cerc-io/stack-orchestrator/issues/441