Create `get-images.sh` script to return all OCI images used in the charm

[mvlassis]

Context

An example script of this would be https://github.com/canonical/admission-webhook-operator/blob/main/tools/get-images.sh. This would be useful when doing vulnerability scanning on our solutions

What needs to get done

Create get-images.sh on this repositories under the tools/ subdirectory

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-8551.

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