[#6196] feat(iceberg): adjust table distribution if creating table without specifying disribution mode

[FANNG1]

What changes were proposed in this pull request?

Adjust the distribution mode for creating Iceberg table with none distribution. the following is the Spark adjust logic, the flink is similar.

  private DistributionMode defaultWriteDistributionMode() {
    if (table.sortOrder().isSorted()) {
      return RANGE;
    } else if (table.spec().isPartitioned()) {
      return HASH;
    } else {
      return NONE;
    }
  }

Why are the changes needed?

Fix: #6196

Does this PR introduce any user-facing change?

Yes, add document

How was this patch tested?

add UT and IT