safe-global / safe-client-gateway / 6235676719

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Add Safe Relay domain (#680)

- Adds initial version of the Safe Gelato Relay domain
- No changes to the route layer or to the data layer
- Adds dependency to `@safe-global/safe-deployments` – this dependency is used to retrieve the ABI for the Safe contracts
- Adds a `ContractHelper` – the goal of this class is to provide smart-contract decoding functionality to `domain` layer. This class is mostly a wrapper on `viem` functionality but specialises on specific ABI functions (the ABI being the state of the class)
- Adds two implementations of the `ContractHelper`:
  * `Erc20ContractHelper` – uses the ERC20 contract ABI to provide decoding functionality for the `transfer` function
  * `SafeContractHelper` – uses the Safe contract ABI to provide decoding functionality for the `execTransaction` function.


What is out of scope for this commit:
- Safe Relay routes – no routes were implemented. This PR mostly targets the business logic on the domain side
- `data` layer – no datasources were added. This will be where the API which targets the Gelato Relay Service will be added
- Handling of Multisend payloads
- Handling of Create Proxy with Nonce payloads

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