feat(routing-table): provide rt and routes functionality

[h3adex]

Description

This PR adds functionality to list and describe routing tables, as well as perform full CRUD operations on routes within those tables. It does not include support for creating or attaching routing tables, as those operations are currently intended to be managed exclusively through Terraform.

This implementation is primarily aimed at enabling users to inspect and debug routes created via Terraform. Once the routing table feature reaches GA, support for creating routing tables and attaching them to networks will be added to the CLI.

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)

[h3adex]

Update waiting for go-sdk iaas api update ^

[github-actions]

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[h3adex]

Rebased PR and added the option to update system_routes flag of a routing-table since it was added to the GO-SDK in the meanwhile: https://github.com/stackitcloud/stackit-sdk-go/blob/main/services/iaas/CHANGELOG.md#v130

[rubenhoenle]

@h3adex Please consider splitting such changes into smaller PRs next time (e.g. one PR for introducing routing tables and one PR for introducing routes). This PR is pretty hard to handle in it's current state. 😅

[rubenhoenle]

@h3adex Could you please resolve the open comments?

[github-actions]

This PR was marked as stale after 7 days of inactivity and will be closed after another 7 days of further inactivity. If this PR should be kept open, just add a comment, remove the stale label or push new commits to it.