[spark][core] Support input_file_name UDF

[YannByron]

Purpose

Linked issue: close #xxx

Tests

API and Format

Documentation

[JingsongLi]

Thanks @YannByron for the contribution.

Hooks have invaded a lot of core code.
Consider simpler solutions:

Step 1: Modify paimon-core

Just rename RecordWithPositionIterator to FileRecordIterator.

interface FileRecordIterator<T> extends RecordReader.RecordIterator<T> {

      Path filePath();

      long returnedPosition();

      T next() throws IOException;
}

The filePath is a final member for a FileRecordIterator. One FileRecordIterator should just for only one file.

Step 2: Modify paimon-spark

We can introduce a FileHolderRecordReader to paimon-spark, to wrap old reader returned by paimon-core, In this reader, if the returned iterator is a FileRecordIterator, we can invoke InputFileBlockHolder.set and unset.

[JingsongLi]

LGTM!

[YannByron]

#3057