* imprv: Add a parameter to allow ExtKeyUsage field usage from a role
* chore: Add the changelog entry
* imprv: Reword UI and changelog
* doc: Add allow_role_extkeyusage in parameter list
* imprv: Align variable names with existing fields/codebase
* Add unit test and tweak some labels
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Co-authored-by: Steve Clark <steven.clark@hashicorp.com>