feat(protocol): Span Batch Signature Type

[refcell]

Description

Ports the span batch signature type to op-alloy-protocol.

Provenance

Part of a port migrating the batch types from kona-derive to op-alloy. See kona#695.

[refcell]

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This comment was automatically generated by st.

[refcell]

what is the difference between this and Signature?

I think we can remove this and just use Signature.