Extend "get collection" use case to return theme

[vera]

What this PR does / why we need it:

This PR extends the "Get a collection" use case to also return its theme info, which is returned by the Dataverse API.

Which issue(s) this PR closes:

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Related Dataverse PRs:

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Special notes for your reviewer:

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Suggestions on how to test this:

Use getCollection.execute(collectionId) to read a collection. If it has a theme configured, e.g. a logo, that should be returned as part of the response.

Is there a release notes or changelog update needed for this change?:

Yes

Additional documentation:

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[ChengShi-1]

Thanks for you contribution! This is really good. Could you also update the following?

1. changelog.md
2. integration test
3. unit test

[ChengShi-1]

After reviewing the backend, it appears that they are all optional.

[vera]

Thanks for you contribution! This is really good. Could you also update the following?

1. changelog.md

2. integration test

3. unit test

Thank you for the review :) I've updated the changelog and added a unit test.

For the integration test, I wasn't sure how to set up a comprehensive test for retrieving a theme, since I think that Dataverse doesn't have an API for setting a collection theme yet (? IQSS/dataverse#10194). But I have added a very simple integration test.

[ChengShi-1]

Hi Vera, thanks for the changes. The integration test is failing because some of our storage driver api changed, which would be fixed by #431. I'll reply again when that one is merged, and then you could merge with the dev branch to make all checks pass.

[vera]

Hi Vera, thanks for the changes. The integration test is failing because some of our storage driver api changed, which would be fixed by #431. I'll reply again when that one is merged, and then you could merge with the dev branch to make all checks pass.

OK! 👍