ERC 7779 support

[filmakarov]

Draft implementation of ERC-7779 support for Nexus

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PR-Codex overview

This PR introduces a MockERC7779 contract for testing, modifies storage location constants, and enhances the Nexus contract to integrate ERC7779Adapter. It also adds functionality for managing storage bases and updates validation logic.

Detailed summary

• Added MockERC7779 contract with addStorageBase function.
• Changed _STORAGE_LOCATION to _NEXUS_STORAGE_LOCATION in Storage.sol.
• Implemented accountStorageBases and _addStorageBase functions in ERC7779Adapter.
• Updated Nexus to inherit from ERC7779Adapter and modified initialization logic.
• Removed _checkUserOpSignature function from Nexus.

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[openzeppelin-code]

ERC 7779 support

Generated at commit: a968100c23059d8a797b6ce9ae35adcd33716910

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	1 1 0 6 28 36

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For more details view the full report in OpenZeppelin Code Inspector

[github-actions]

🤖 Slither Analysis Report 🔎

Slither report

# Slither report

THIS CHECKLIST IS NOT COMPLETE. Use --show-ignored-findings to show all the results.
Summary
🟡 - locked-ether (1 results) (Medium)

• constable-states (2 results) (Optimization)

locked-ether

🟡 Impact: Medium
🔴 Confidence: High

• ID-0
  Contract locking ether found:
  Contract NexusBootstrap has payable functions:
  • ModuleManager.receive()
  • ModuleManager.fallback(bytes)
  • NexusBootstrap.initNexusWithSingleValidator(IModule,bytes,IERC7484,address[],uint8)
  • NexusBootstrap.initNexus(BootstrapConfig[],BootstrapConfig[],BootstrapConfig,BootstrapConfig[],IERC7484,address[],uint8)
  • NexusBootstrap.initNexusScoped(BootstrapConfig[],BootstrapConfig,IERC7484,address[],uint8)
    But does not have a function to withdraw the ether

utils/NexusBootstrap.sol#L33-L185

constable-states

Impact: Optimization
🔴 Confidence: High

• ID-1
  RegistryAdapter.registry should be constant

base/RegistryAdapter.sol#L10

• ID-2
  RegistryFactory.threshold should be constant

factory/RegistryFactory.sol#L38

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