Add system contracts KIP-81, 103, 113, 149

[ian0371]

Proposed changes

This PR adds Klaytn system contracts KIP-81, 103, 113, 149 + audit reports.

Due to linter fail, I had to add .solhintignore and add .prettierignore. They ignore the protocol directory, as it must match the audit report.

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[ian0371]

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