refactor(protocol): restructure solidity code to match compilation targets

[dantaik]

Summary

Prior to this PR, both L1 and L2 code were compiled using the same Solidity compilation target (cancun), which worked for now but is incompatible with future Solidity versions.

This PR reorganizes the Solidity codebase into three subdirectories:

• shared: Contains contracts used by both L1 and L2.
• layer1: Contains L1-specific contracts.
• layer2: Contains L2-specific contracts.

For L1 compilation, the source directory is now contracts/layer1, with contracts/shared automatically included. The EVM target for L1 is specified as cancun. Similarly, L2 uses contracts/layer2 as the source and out/layer2 as the destination with its EVM target set to shanghai. The build directories for L1 and L2 are also separately defined.

You can use commands to test contracts for layer1 and layer2 separately now:

• pnpm compile:l1, pnpm compile:l2, or pnpm compile to compile all files.
• pnpm test:l1, pnpm test:l2, , or pnpm test to run all tests.

Note that:

• Going forward, it's critical to ensure that the contracts in the shared directory remain compatible with both the layer1 and layer2 codebases.
• Minimal code changes in EssentialContract.sol and Bridge.sol. Please focus on reviewing these specific changes.

This is a large PR, but the majority of the changes involve the directory restructuring rather than the code itself.

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[openzeppelin-code]

refactor(protocol): restructure solidity code to match compilation targets

Generated at commit: dbf5ef92c9a6d8ea838fc6da618632e9e9b6f53d

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 2 0 8 43 55
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector

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