feat: Add AutoEvent Retention Model and DTO

[weichou1229]

Add AutoEvent Retention Model and DTO for event retention enhancement

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?) not impact
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?) feat: Update Event Retention doc edgex-docs#1415

Testing Instructions

New Dependency Instructions (If applicable)

[cloudxxx8]

LGTM