Deserialize hex keys early to shortcut on invalid input, and re-use the account storageTrie for each proof for each proof in the account, preventing repeated deep-copying of the trie.

Closes #27308

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Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>