feat(core): add one change show

[paularmstrong]

Problem:

While it's easy to inspect the files in the .changes folder(s), it would be more helpful to have a command that could list and preview the changes together, including dependencies that need versioning.

Solution:

Adds one change show to preview versions and changelogs. Minimal for now, ripe for making prettier.

Related issues:

Fixes #656

Checklist:

• Added or updated tests
• Added or updated documentation
• Ensured the pre-commit hooks ran successfully

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