Added optional projection to IPC FileReader

[jorgecarleitao]

• ipc::read::FileReader::new now accept a new parameter projection: Option<Vec<usize>> that can be used to filter columns.
• read::ipc::read_record_batch now accept a new parameter projection: Option<(&[usize], Arc<Schema>)> that can be used to filter columns.

where usize is the index of the column in the IPC schema (known from the file metadata).

Pass None to both to recover the original behavior.

[jorgecarleitao]

Closed by #264