Added AES-256 encrypted parquet generated from parquet-java

[hsiang-c]

Context

• For testing AES_256_GCM algorithm in [parquet] Allow more encryption algorithms arrow-rs#9203

Data Preparation

• Both files are produced by Parquet Java's TestEncryptionOptions with 32-byte footer key and column keys
• In addition, I need to disable page write checksum: withPageWriteChecksumEnabled(false) so that arrow-rs can read it w/o issue.

[hsiang-c]

cc @adamreeve

[adamreeve]

Thanks @hsiang-c! Can you please update the data/README.md file and document the keys that have been used in these files?

There's an existing section about the encrypted files at https://github.com/apache/parquet-testing/blob/master/data/README.md#encrypted-files

[adamreeve]

I've checked I can read these files with C++ Parquet. How annoying would it be to make the data match what's in the existing encrypted files in this repository? It would greatly simplify adding a C++ test for these if the data is the same, then I could reuse the existing test functions, but it's probably OK if the data is different.