Implement Stacks RFC0003: Stack Descriptor and Tooling

[ryanmoran]

RFC

Summary

The stack-building codebase, create-stack should be moved into the jam tooling CLI, and allow users to configure their stack build via a common configuration file.

Implementation

The create-stack command will be refactored to support this new configuration file format and the features it allows. The codebase will then be moved into the jam codebase as a command within that tool. This aligns more with how the project maintains its tooling and allows us to keep tooling consolidated under the tooling subteam.

The stacks team will be granted CODEOWNERS status for this addition to the codebase.