Feat/erc 7821 support

[filmakarov]

PR-Codex overview

This PR focuses on upgrading the Nexus smart contract and related libraries to enhance functionality, including the introduction of new mode selectors, updates to versioning, and improvements in execution handling.

Detailed summary

• Updated Nexus version from 1.0.1 to 2.0.0.
• Added new ModeSelector constants for ERC-7821 batch operations.
• Modified execute function to handle execution data more effectively.
• Introduced _checkAndUpdateExecutionFrames to manage execution limits.
• Updated _eip7702SignatureValidation for signature checks.
• Enhanced supportsExecutionMode logic for better mode validation.
• Improved error handling and revert conditions in various functions.
• Added hashExecutionBatch and hashExecution functions in ExecLib for hashing execution data.

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[openzeppelin-code]

Feat/erc 7821 support

Generated at commit: 1dd3c204ebb78eba52958eccef2d71924dd22c0b

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	1 1 0 6 30 38

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For more details view the full report in OpenZeppelin Code Inspector