feat(iaas): onboard routing-table command

[h3adex]

Description

Onboards routing-table command

Checklist

• Issue was linked above
• Code format was applied: make fmt
• Examples were added / adjusted (see e.g. here)
• Docs are up-to-date: make generate-docs (will be checked by CI)
• Unit tests got implemented or updated
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[marceljk]

Just tested the new routing-tables commands and they work like a charm. The only issue I found was that the label-selector isn't correctly set in the request and so the flag doesn't work as intended.
Beside that the PR is approved from my side 😃