Automatically detect and prevent breaking changes

[Velfi]

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Tell us about your request

Create a CI script that scans the SDK at some point before a release and ensures that no breaking changes were introduced that broke backwards compatibility

Tell us about the problem you're trying to solve.

Breaking changes are a significant event. This tool would ensure that we don't unintentionally release a new version with a breaking change.

Are you currently working around this issue?

n/a

Additional context

• [ ] additional tooling around rust semVerVer run it
• [ ] https://github.com/awslabs/smithy-rs/pull/1194