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Implement Support for ERC-4337 EntryPoint v0.7 (#243)

**This PR**:
- Addresses the M-01 from the audit by updating the ERC-4337 contracts
to the latest ones from the development branch (presumably, they will be
released as version 0.7.0). The most notable change is the new
`PackedUserOperation` struct with the new packed gas limit field
`accountGasLimits` that consists of two `uint128` packed values
`(validationGasLimit, callGasLimit)`
- Implements https://github.com/safe-global/safe-modules/issues/225

Forked contracts repo with build artifacts:
https://github.com/5afe/account-abstraction
More about 0.7.0 changes:
https://github.com/safe-global/safe-modules/issues/215

**Issues/concerns**:
- Using unaudited non-release candidate contract versions
- The reference bundler is still in development, thus e2e tests are
failing (Confirmed with ERC4337 team)

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Co-authored-by: Nicholas Rodrigues Lordello <nick@safe.global>

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