PoC: `inflate` command

[ecordell]

Description of the change:

Adds an opm alpha inflate command that takes as input a veneer api and outputs a declarative config.

Each veneer "strategy" is defined by a cue file built into the project. Strategies can also be provided directly by the user. Strategy development guide coming soon.

Example:

opm alpha inflate example_yaml -o yaml

Motivation for the change:

• Provide veneer apis for DC users.
• Veneer API users don't need to know about how veneer apis are built at all, but:
• Wanted a system easy to extend both for opm maintainers and opm users
  • opm maintainers can write new veneers by embedding a cue file
  • opm users can provide custom veneer strategies by passing a cue file as input

Reviewer Checklist

• [ ] Implementation matches the proposed design, or proposal is updated to match implementation
• [ ] Sufficient unit test coverage
• [ ] Sufficient end-to-end test coverage
• [ ] Docs updated or added to /docs
• [ ] Commit messages sensible and descriptive

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ecordell

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[openshift-ci[bot]]

@ecordell: PR needs rebase.

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