epic: load cairo models from json

[ClementWalter]

Why

The cairo codebase uses model.cairo to define struct used throughout the program. These models (like State or Account) need to be initialized in memory from external data (json for ef-tests, reth struct for the main runner).

What

Tasks

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1. feat: deserialize ef-tests data in python #38
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2. feat: deserialize rust exex/alloy data types #37
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