chore: Make `arrow` an optional dependency

deepset-ai / haystack

:mag: AI orchestration framework to build customizable, production-ready LLM applications. Connect components (models, vector DBs, file converters) to pipelines or agents that can interact with your data. With advanced retrieval methods, it's best suited for building RAG, question answering, semantic search or conversational agent chatbots.

Apache License 2.0

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Related Issues

Relates to #8233

Proposed Changes:

Make the recently introduced arrow dependency an lazily imported one.

How did you test it?

I added unit tests and ran them locally.

Notes for the reviewer

I won't add a release notes as this doesn't changes anything that has been released already.

Checklist

I have read the contributors guidelines and the code of conduct
I have updated the related issue with new insights and changes
I added unit tests and updated the docstrings
I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
I documented my code
I ran pre-commit hooks and fixed any issue

Totals
Change from base Build 10773939667:	0.007%
Covered Lines:	7092
Relevant Lines:	7853

Totals

Change from base Build 10773939667:

0.007%

Covered Lines:

7092

Relevant Lines:

7853

deepset-ai / haystack