Refactor aes encryptor

[sofia-tekdatum]

Continuing with the AesEncryptor refactor.

In this next step I rename everything related to encryption_internal as aes_encryption.

Updating all the includes, tests and CMake files.

Verified all encryption unit tests work:
parquet-encryption-key-management-test
parquet-encryption-test

This removes a lot of confusion, as there are encryption_internal and internal_file_encryptor files.

In the next PR I can make the intended change, which is to have the AesEncryptors inherit from the new EncryptorInterface.

[github-actions]

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[argmarco-tkd]

LGTM. Thank you so much for this refactor! it makes the code sooo much easier to navigate and understand!

[sofia-tekdatum]

Testing update:

Ran
From cpp/build:
./release/parquet-encryption-test
./release/parquet-encryption-key-management-test
./release/arrow-dataset-file-parquet-encryption-test

From python:
python -m pytest pyarrow/tests/parquet/test_encryption.py
python -m pytest pyarrow/tests/parquet/test_external_encryption.py
python -m pytest pyarrow/tests/test_dataset_encryption.py

All passed.