Add flag-driven event publisher

[evankanderson]

Summary

Adds an event publisher which selects between two event publishing channels based on flag configuration.

Change Type

Mark the type of change your PR introduces:

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

Manual testing between go-channel and nats, then wrote a unit test.

Note: I used two go channels for the tests, because the setup for those is easier. I could switch one to NATS if desired.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

Pull Request Test Coverage Report for Build 11450469659

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 76 of 99 (76.77%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 54.812%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/service/service.go	0	3	0.0%
internal/events/flagged_driver.go	67	87	77.01%

Totals
Change from base Build 11441554036:	0.1%
Covered Lines:	14995
Relevant Lines:	27357

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💛 - Coveralls