feat: add ability to update pipeline topic list at runtime.

[eaton-coreymutter]

This is useful for app services that need to dynamically adjust what devices/events/topics they are interested in.

Closes: #1750

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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?)
• 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 (feat(microservices): add ability to update pipeline topic list at run… edgex-docs#1479

Testing Instructions

I have tested locally with the in-progress edgedfoundry-holding/edgex-sse service.

New Dependency Instructions (If applicable)

N/A

[eaton-coreymutter]

Looks like I missed the mocks, I ran "go test" but not "make test". Updating...