Add ArrowReaderBuilder::schema() #94
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This allows getting the schema before building a reader; so users can
apply transformations to the schema, like this:
```
let reader_builder = reader_builder
.with_projection(projection.clone())
.with_batch_size(ORC_BATCH_SIZE);
let schema = transform_schema(&reader_builder.schema());
let reader = reader_builder.with_schema(schema).build();
```
where `transform_schema` could, for example, be a function that changes
the `TimeUnit` of `Timestamp` datatypes.
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This allows getting the schema before building a reader; so users can apply transformations to the schema, like this:
where
transform_schemacould, for example, be a function that changes theTimeUnitofTimestampdatatypes.