feat: Align ERC‑8021 Schema 1 serialization, deserialization with EIP‑8021 (variable‑length chainId)

[wbj-cb]

What

• Updates Attribution.fromData to deserialize the variable length registry section from schema 1
• Updates Attribution.toDataSuffix to serialize the variable length registry section when schema 1
• Updates tests and adds additional tests cases to verify round tripping results in the same payload

Why:

EIP‑8021 changed to have variable‑length chainId for Schema 1:

Schema ID 1 builds on top of 0, but also defines a custom Code Registry chain and address

1. codesLength (1 byte): Length of the codes array in bytes, including delimiters
2. codes (variable length): Array of attribution codes using ASCII encoding with comma (0x2C) as delimiter
3. codeRegistryChainIdLength (1 byte): Length of the chain id hosting the custom Code Registry
4. codeRegistryChainId (variable bytes): Chain id hosting the custom Code Registry
5. codeRegistryAddress (20 bytes): Address of a smart contract implementing ICodeRegistry
   Custom Code Registries can be referenced across chains for ease of connecting identity for multi-chain apps.

From https://eip.tools/eip/8021

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