Fix loading lookup extension

[TessaIO]

Resolves #17337.

Description

This PR aims to change the behavior of the druid lookups-cached-single extension. In fact, we aim to introduce the option to iterate over fetched data from the dataFetcher. We need this in the case of loadingLookups, that's why these changes don't impact the pollingLookup feature.
I also added the handling of a use case where the data exists in Druid but not in the actual data fetcher, which is in our use-case JDBC Data fetcher.

Release note

Support iterating over fetched data for the loadinglookups for the druid lookups-cached-single extension

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Key changed/added classes in this PR

• Support iterating over fetched data for the loadinglookups for the druid lookups-cached-single extension

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[TessaIO]

@cryptoe @LakshSingla @kfaraz Can you guys take a quick look at this?

[TessaIO]

@abhishekrb19 can you please re-run the pipeline one more time?

[TessaIO]

@Akshat-Jain thanks for the review! PR updated, can you give it one more round?

[abhishekrb19]

Some minor comments

[TessaIO]

@Akshat-Jain @abhishekrb19 Thanks for the review. One more round please.

[abhishekrb19]

@TessaIO a final set of comments. Looks good otherwise, thanks!

Also, we don't typically force push changes to make reviewing easier. The commits will be squashed and merged as one when committing to master.

[TessaIO]

@abhishekrb19 PR updated!

[Akshat-Jain]

Thanks for the PR and for addressing all the review comments!
Looks good to me! :)

[abhishekrb19]

Thanks for your first contribution @TessaIO, and thanks to @Akshat-Jain for the in-depth review!

@TessaIO, do you mind merging the latest master into this branch to get a clean CI run? I can commit this change after that.

[TessaIO]

@abhishekrb19 done

[TessaIO]

@abhishekrb19 in which version will the fix be included?

[TessaIO]

@kfaraz is there a plan to include this fix in new releases?