client: kaustinen7 verkle testnet preparation

[gabrocheleau]

This PR makes the following updates to ready our client for Kaustinen stateless syncing:

• Removes the stateRoot handling and caching for the previous block. The parent block's stateRoot will now be provided in the verkle execution witness directly, so we can retrieve it from it.
• Updates the Verkle leaf structure. The version, nonce, balance and codeSize fields have been packed into a single BASIC_DATA field. See Update EIP-4762: reworked gas schedule from interop ethereum/EIPs#8550 for more details.
• Update test data to Kaustinen7 test data
• Test Kaustinen7 syncing