Implement rolling manifest-writers

[Fokko]

Feature Request / Improvement

Once we get support for merge-append #363 operations, and also compaction in the future, it would be good to have rolling-manifest writers that open a new file once the manifest gets to a certain size (both bytes and number of entries). This makes sure that Iceberg tables have decent parallelization when doing query planning.

[felixscherz]

Hi, I would like to give this a shot if no one else is currently working on this:)
I see the java implementation has a RollingManifestWriter so I'd start there.