Reorganize kvp so that KeyValuePairs is an alias for BTreeMap instead of newtyping it

[nightkr]

Description

This is effectively an extended version of #888 (and supersedes it).

Definition of Done Checklist

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Author

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1. Changes are OpenShift compatible
2. CRD changes approved
3. Integration tests passed (for non trivial changes)

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1. Code contains useful comments
2. (Integration-)Test cases added
3. Documentation added or updated
4. Changelog updated
5. Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

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1. Feature Tracker has been updated
2. Proper release label has been added