feat: add subscribe/unsubscribe ack handling

[hackeramitkumar]

Description

Fixes: #1057

Type of Change

• Bugfix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov]

Codecov Report

❌ Patch coverage is 54.11255% with 106 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
data-plane/core/controller/src/service.rs	2.43%	80 Missing ⚠️
data-plane/core/service/src/app.rs	72.85%	19 Missing ⚠️
data-plane/core/datapath/src/message_processing.rs	91.13%	7 Missing ⚠️

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