revert if account is already created for salt

[coffeexcoin]

PR-Codex overview

This PR focuses on enhancing the AccountFactory contract by adding a check to prevent the deployment of accounts with the same salt and improving error handling for invalid initializers.

Detailed summary

• Added a check in AccountFactory.sol to revert if an account with the same salt already exists.
• Updated the error handling in Errors.sol to include a new error ALREADY_CREATED().
• Modified tests in deployer.test.ts to include salt when deploying accounts and check for INVALID_INITIALIZER errors.

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