Retain table statistics during orphan files removal

[findepi]

Do not delete table statistics files when running remove_orphan_files.

Extracted from https://github.com/apache/iceberg/pull/4741 and based on that PR, and also on https://github.com/apache/iceberg/pull/5794 and https://github.com/apache/iceberg/pull/5799.

[findepi]

rebased after https://github.com/apache/iceberg/pull/5799 merged, no other changes

currently, depends on https://github.com/apache/iceberg/pull/5794

[findepi]

Rebased after https://github.com/apache/iceberg/pull/5794 is merged.

@rdblue please take a look

[findepi]

This looks fine, but it requires the public API to return statisticsFiles from Table so we should get that one in first.

please see my response: https://github.com/apache/iceberg/pull/5795#discussion_r983265802

[findepi]

Applied or responded to comments. I didn't do anything with the public Table API yet. I think, however, it shouldn't be a blocker, since the affected ReachableFileUtil class already depends on non-API information in other methods. We can improve ReachableFileUtil after https://github.com/apache/iceberg/pull/4741, or we can land https://github.com/apache/iceberg/pull/4741 first and improve here.

@rdblue please take another look.

[findepi]

(just rebased after https://github.com/apache/iceberg/pull/4741 merged, no changes yet)

[findepi]

This looks fine, but it requires the public API to return statisticsFiles from Table so we should get that one in first.

Done now.

@rdblue please take another look

[rdblue]

Thanks, @findepi! I merged this.

[findepi]

thank you @rdblue for the merge!