Derive CanonicalSerialize on AffineColumn and similar

[ggwpez]

Affected: AffineColumn, FieldColumn, FixedColumns, ProverKey
I see they are commented out, so I guess there is a reason for that. But when i update the dependency then these derives seem to be needed.

https://github.com/w3f/ring-proof//blob/df6eda88c6095c97b3914a2cef22d0577e254426/w3f-plonk-common/src/gadgets/ec/mod.rs#L19