Allow configuring how components are dialed

[ntnn]

Summary

When running kcp-operator across multiple clusters components are not reachable through the service URLs.
This allows a user to configure how a component can be reached.

I'm not super happy with it yet, esp. because this only works for imports, hence a draft.

What Type of PR Is This?

/kind feature

Related Issue(s)

Fixes #

Release Notes

NONE

[kcp-ci-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

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[mjudeikis]

rebase is needed now

[kcp-ci-bot]

PR needs rebase.

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