[R] Arrow/Parquet can't open encrypted parquet files

I have some programs written in C++ that use ARROW/PARQUET in encrypted format, but int order to check the data stored in parquet files, I need a quick way to check it, so I thought R could be useful for me, but I can't find the way to pass the "key" to decrypt the data (in R).

I think it is an unsupported feature (not supported yet)!

**Reporter**: [Jaime Salvador](https://issues.apache.org/jira/browse/ARROW-15458)

_{**Note**: *This issue was originally created as [ARROW-15458](https://issues.apache.org/jira/browse/ARROW-15458). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

The issue names R and encrypted Parquet files but no source file, test, or entry point. Start by locating the R Parquet reader and its existing encryption configuration path, then define done as passing a decryption key and opening an encrypted file, with coverage for that path.

Written by the indexing model from the issue text.