docs(kafka): add recent kafka enhancements

[sicoyle]

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Description

Add new kafka metadata fields with some recent PRs getting merged.
dapr/components-contrib#3375
dapr/components-contrib#3371

Issue reference

[github-actions]

Stale PR, paging all reviewers

[msfussell]

LGTM

[marcduiker]

@holopin-bot @sicoyle Thanks Sam! 😁

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