in_event_type: implement pause/resume to stop timed collector.

[pwhelan]

Summary

This is a backport to 4.0 of the PR #10843.

Description

Implement a simple pause/resume callback for in_event_type which pauses it's interval collector so it can safely shutdown, avoiding memory leaks.

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Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pwhelan-backport-in_event_type-implement-pause-resume-4.0

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