use RecordBatchTransformerBuilder instead of RecordBatchTransformer

[kevinjqliu]

Which issue does this PR close?

• Closes #.

What changes are included in this PR?

This should fix CI, currently broken with

795 |             RecordBatchTransformer::build(snapshot_schema, &projected_iceberg_field_ids);
    |                                     ^^^^^ function or associated item not found in `RecordBatchTransformer`

Likely due to merge conflict between https://github.com/apache/iceberg-rust/pull/1847/files#diff-640415fbb0b37eac6f774eff524fb364c4e54c02da3a3c0e355af5caa941007cR637 and https://github.com/apache/iceberg-rust/pull/1821/files#diff-640415fbb0b37eac6f774eff524fb364c4e54c02da3a3c0e355af5caa941007cR149

Are these changes tested?