Make REST Catalog Namespace Separator Configurable

[sungwy]

Feature Request / Improvement

Similar to the proposed changes in Java/ REST Catalog Open API Spec, we'd like to make the REST Catalog Namespace Separator Configurable address issued in specific catalog implementations.

Related PRs:
apache/iceberg#10877
apache/iceberg#10904
apache/iceberg#10905

[github-actions]

This issue has been automatically marked as stale because it has been open for 180 days with no activity. It will be closed in next 14 days if no further activity occurs. To permanently prevent this issue from being considered stale, add the label 'not-stale', but commenting on the issue is preferred when possible.

[github-actions]

This issue has been automatically marked as stale because it has been open for 180 days with no activity. It will be closed in next 14 days if no further activity occurs. To permanently prevent this issue from being considered stale, add the label 'not-stale', but commenting on the issue is preferred when possible.

[github-actions]

This issue has been closed because it has not received any activity in the last 14 days since being marked as 'stale'