PyIceberg Production Use case survey

### Feature Request / Improvement

As part of the journey toward version 1.0, we want to capture how this library is used in "production" environments.

Would love to hear from current users (and potential users) on different use cases. This will better inform the future roadmap.

Please include use cases in this issue, or if necessary I can start a Google Survey.

Start with the issue discussion and review the 15 existing comments for production and potential-user use cases. No files or tests are named; done means gathering representative PyIceberg production-use information in the issue or creating and using the proposed Google Survey to inform the future roadmap.

Written by the indexing model from the issue text.