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PARQUET-918: Keep ordering in column indices when converting Parquet Schema

This is a follow up fix for [PARQUET-918](https://github.com/apache/parquet-cpp/pull/295), do I need to create another jira for this?

Looks like some .idea files are included by accident. It looks no harm. Do I need to revert them?@wesm

cc @wesm @itaiin  for reviewing

Author: Xianjin YE <advancedxy@gmail.com>

Closes #297 from advancedxy/master and squashes the following commits:

e606d9d [Xianjin YE] Add .idea/ to .gitignore and make style check happy.
1adb192 [Xianjin YE] Add API doc for FromParquetSchema(parquet_schema, column_indices, out)
8de263b [Xianjin YE] Keep ordering in column indices when converting Parquet Schema to Arrow Schema

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