feat: prettify json output using stackit curl

[h3adex]

Description

When using the stackit curl command, it's more readable to prettify the JSON response, especially on systems without tools like jq or yq for easy content extraction. Additionally, I've introduced an error message for expired JWT tokens.

Test it out:

./bin/stackit curl "https://iaas.api.eu01.stackit.cloud/v1beta1/networks/public-ip-ranges"
./bin/stackit curl "https://iaas.api.eu01.stackit.cloud/v1beta1/networks/public-ip-ranges" | jq
./bin/stackit curl "https://iaas.api.eu01.stackit.cloud/v1beta1/networks/public-ip-ranges" | yq eval '.items[].cidr'

Error messages stackit curl:
Old:

New:

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)

[github-actions]

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[h3adex]

Bump

[Fyusel]

Thank you for submitting this improvement!