Retrieve array from RecordBatch for a leaf column

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**

While working filter pushdown for iceberg-rs: https://github.com/apache/iceberg-rust/pull/295, I am going to use the APIs like `ArrowPredicateFn` and `RowFilter`.

When constructing `ArrowPredicateFn` for iceberg predicate, we provide a filtering function that takes `RecordBatch` based on the given projection.

The `RecordBatch` contains the columns specified in the projection. And we need to access correct column in the batch to evaluate the predicate.

For top-level column, it should be straightforward. But for nested column, seems no way to access the particular array from the `RecordBatch`.

We only have the projection (i.e., `ProjectionMask`) which contains indices of leaf columns in the batch.

For example, if the schema has `[a, b, c]` top columns. `b` is a struct column with `[aa, bb, cc]` columns. Give a predicate like `cc > 1`, and we know the leaf indices of the nested column `cc` is 3.

Is there API we can use to access the array of `cc` in the `RecordBatch`?

**Describe the solution you'd like**

**Describe alternatives you've considered**

**Additional context**

Start by reading the RecordBatch, ProjectionMask, ArrowPredicateFn, and RowFilter APIs described in the issue, focusing on how leaf indices map to nested columns. Done means providing or documenting an API that retrieves the array for a nested leaf such as cc from the projected RecordBatch, with the behavior clear for top-level and nested columns.

Written by the indexing model from the issue text.