ROX-26344: adds runtime configuration to collector

[Stringy]

Description

Includes support for enabling/disabling external IPs based on runtime config, deferring to existing feature flag if none is provided

In subsequent PRs, the runtime configuration will be populated.

Checklist

• [ ] Investigated and inspected CI test results
• [ ] Updated documentation accordingly

Automated testing

• [x] Added unit tests ~- [ ] Added integration tests~ ~- [ ] Added regression tests~

If any of these don't apply, please comment below.

Testing Performed

Unit tests added to exercise the intended behaviour. It is not possible to integration-test this until Sensor->Collector communication has been built.