[I] [Ruby] Provide an equivalent of Pyarrow's `.to_pylist` [arrow]

[via GitHub]

fpacanowski opened a new issue, #45122:
URL: https://github.com/apache/arrow/issues/45122

   ### Describe the enhancement requested
   
   In certain use cases it's quite useful to convert a `RecordBatch` or a 
`Table` to an array of hashes, e.g. when using Parquet for data exchange. 
Pyarrow provides this functionality as 
[to_pylist](https://arrow.apache.org/docs/python/generated/pyarrow.Table.html#pyarrow.Table.to_pylist)
 function.
   
   Basically I'd love to see an inverse of `Arrow::RecordBatchBuilder.build`.
   ```ruby
   rb = Arrow::RecordBatchBuilder.build(schema, data)
   assert rb.to_pylist == data
   ```
   
   Additionally it would be great if it correctly handled struct and list data 
type, for example:
   ```ruby
   schema = Arrow::Schema.new([
     Arrow::Field.new("c1", :int32),
     Arrow::Field.new("c2",
       Arrow::StructDataType.new([
         Arrow::Field.new("c3", :int32),
         Arrow::Field.new("c4",
           Arrow::StructDataType.new([
             Arrow::Field.new("c5", :int32),
             Arrow::Field.new("c6", Arrow::ListDataType.new(:int32)),
           ])
         )
       ])
     )
   ])
   
   data = [
       {c1: 1, c2: {c3: 3, c4: {c5: 5, c6: [6, 7]}}},
       {c1: 11, c2: {c3: 13, c4: {c5: 15, c6: [16, 17]}}},
   ]
   rb = Arrow::RecordBatchBuilder.build(schema, data)
   assert rb.to_pylist == data
   ```
   
   (Obviously the method wouldn't be named `to_pylist`.)
   
   ### Component(s)
   
   Ruby


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