[FEATURE] Add import to service instance sharing resource

[lechnerc77]

What area do you want to see improved?

terraform provider

Is your feature request related to a problem? Please describe.

The resource for service instance sharing does not support import. As it is technically possible, this should be supported

Describe the solution you would like

Add import functionality to resource

Describe alternatives you have considered

na

Additional context

Follow-up to PR #132

[github-actions]

Thanks for the feature request. We evaluate it and update the issue accordingly.

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