Implement a common BlockCipherPadding Interface

[Kalkwst]

We currently have four algorithms that implement block cipher padding. These implementations essentially share the same functions: AddPadding, RemovePadding and GetPaddingCount.

I am also planning to add three more padding algorithms that are essentially block cipher paddings.

Having a common interface would help maintain uniformity among all these algorithms.

Looking forward to your thoughts on this.

[github-actions]

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[siriak]

Done