aes: add AES encryption and decryption elements

This element adds support for AES encryption and decryption using the OpenSSL library.

Here are more details on AES encryption with OpenSSL.

Here is a sample pipeline to encrypt and then decrypt some text:

$ echo "0123456789ABCDEF012345678" > plain.txt
$ gst-launch-1.0 filesrc location=plain.txt ! aesenc key=1f9423681beb9a79215820f6bda73d0f \
iv=e9aa8e834d8d70b7e0d254ff670dd718  ! aesdec key=1f9423681beb9a79215820f6bda73d0f \
iv=e9aa8e834d8d70b7e0d254ff670dd718! filesink location=dec.txt
$ cat dec.txt

Just shortly took a look over the obvious parts, will do a proper review once those are addressed.

Also are you aware of https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/tree/master/generic/sodium ?

Thanks, wasn't aware of that plugin. libsodium seems like a nice alternative to openssl.

better to have a plugin with two separate elements than using the same element name with mode ?

better to have a plugin with two separate elements than using the same element name with mode ?

I think so too, yes

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