Introduce parallelism in Iceberg `migrate` procedure

[krvikash]

Description

Introduce parallelism in Iceberg migrate procedure

Release notes

(X) Release notes are required, with the following suggested text:

# Iceberg
* Improve performance when executing `migrate` procedure. ({issue}`16786`)

[krvikash]

Thanks @findinpath | @ebyhr for the review. I have addressed the comments.

[krvikash]

CI hits https://github.com/trinodb/trino/issues/12818

[alexjo2144]

This is definitely a good improvement for now, but it feels like we should aim for leveraging workers for this procedure if we can.

[github-actions[bot]]

This pull request has gone a while without any activity. Tagging the Trino developer relations team: @bitsondatadev @colebow @mosabua

[mosabua]

:wave: @krvikash @alexjo2144 @ebyhr - this PR has become inactive. We hope you are still interested in working on it. Please discuss next steps such as rebase and further changes.

We're working on closing out old and inactive PRs, so if you're too busy or this has too many merge conflicts to be worth picking back up, we'll be making another pass to close it out in a few weeks.

[github-actions[bot]]

This pull request has gone a while without any activity. Tagging the Trino developer relations team: @bitsondatadev @colebow @mosabua

[github-actions[bot]]

Closing this pull request, as it has been stale for six weeks. Feel free to re-open at any time.