Add a way to track breaking changes

[ethanwharris]

🚀 Feature

We should have a way to track breaking changes (maybe something like the CHANGELOG) so that each release we can have the list of breaking changes in the release notes.

Motivation

Difficult for users to know when a breaking change is introduced

Pitch

A document (BREAKING_CHANGES.md) which lists for each major version the breaking changes:

• for removal of a deprecated feature
• for breaking changes without warning in beta features

Alternatives

Just manually collect this with each release

cc @krshrimali

[stale]

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