New API for creating AES object in WolfCrypt library

[IldarAbdullin-okta]

Hello,

In my C# project I would like to use AES GCM APIs without creating extra native library. In order to use AES APIs directly I need a way how to create Aes object, so ideally I need some wc_AesGcmNew function that creates an object for me

Proposal: Add new API:

WOLFSSL_API Aes*  wc_AesGcmNew();

Function creates and initializes Aes object

After that I can call: wc_AesGcmSetKey wc_AesGcmEncrypt

Thank you!