Adding support for Row Id mapping for composite merge

[darjisagar7]

Description

This PR will create the RowIdMapping which will be used for the composite merges

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for f2560c5: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[Shailesh-Kumar-Singh]

Here we are creating RowIdMappingData struct for every row, for a merge of files totaling N rows, this will be 3N Java heap allocations triggered from Rust through JNI + 4N JNI calls from create_row_id_mapping_object
Instead, since the mapping is just new_row_id = file_start_offset + old_row_id, we can pass only per-file segment metadata (file ID, start offset, row count) across JNI and materialize the full mapping in Java.