AES-CBC with ISO10126 Padding

[amirhosv]

Description of changes:

AES-CBC with ISO10126 Padding

• AWS-LC does not support ISO10126.
• The padding and unpadding are handled in ACCP.
• The padding is explained here: https://www.w3.org/TR/xmlenc-core1/#sec-Padding

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[geedo0]

I've done a partial pass, here's the feedback so far.