feat(erc8021): add serviceCodes field to Attribution schema 2

[dgca]

Adds support for the serviceCodes field (s key) in ERC-8021 Attribution schema 2. This field was recently added to the spec to attribute service-layer participants like block builders, relayers, and solvers.

Changes:

• AttributionSchemaId2 type now includes serviceCodes?: readonly string[]
• Encoding/decoding handles the CBOR s key as string[]
• getSchemaId detects serviceCodes as schema 2
• Tests cover encoding, decoding, roundtrips, empty arrays, and the spec test vector

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commit: 1a8bf17