xts mode

[sidielnikov]

Bro, please add XTS mode for AES

Here are a few examples to help you

https://github.com/tkp1n/ArmAes
not working decryption. If it's not difficult to tell me how to fix the function
DecryptDataUnit256(
in AesKey key,
ref byte tweak,
ref byte ct, nuint ctLen,
ref byte pt)

https://github.com/mikhail-khalizev/XTSSharp