Fix conedison dependency issue

[nickfujita]

• Migrates conedison util functions into widgets repo to fix dependency issues, since it doesn't appear that any other repos are using this separate utils repo

More info: https://github.com/Uniswap/widgets/issues/580#issuecomment-1569453097

Related issues

• https://github.com/Uniswap/widgets/issues/580
• https://github.com/Uniswap/widgets/issues/404

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