fix: exports supports esm

[PeratX]

add support for evm packages.
Fix hardhat v3 The file "contracts/oapp/interfaces/IOAppCore.sol" is not exported by the package.

[cursor]

PR Summary

Ensures Solidity sources are addressable by ESM tools (e.g., Hardhat v3) by exporting contracts/*.sol across EVM packages.

• Add "./contracts/*.sol": "./contracts/*.sol" to exports in oapp-alt-evm, oapp-evm-upgradeable, oapp-evm, oft-alt-evm, oft-evm-upgradeable, oft-evm, and onft-evm packages
• Addresses Hardhat v3 error: file not exported by the package

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