Add support for generating external secret configuration

[remyleone]

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Description

It would be helpful to generate configuration for a given secret for external secrets.

How I imagine scw could expose this functionality

scw secret config get type=external-secret

In particular this command would be referenced in all see-also section of all the other secret commands.

References

• https://www.scaleway.com/en/docs/secret-manager/api-cli/external-secrets/