implement OLMv0 (ordering only, like here)

[grokspawn]

• https://github.com/operator-framework/operator-lifecycle-manager/blob/master/pkg/package-server/provider/registry.go#L329-L343
• https://github.com/operator-framework/operator-registry/blob/master/pkg/lib/semver/semver.go#L11

Leverage new composite version methods (i.e. model.Compare, declcfg.Compare) wherever possible.

[github-actions]

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[github-actions]

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