Add unpause function in L1CrossDomainMessenger contract

[boyuan-chen]

Description

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Add unpause function in L1CrossDomainMessenger contract

Tests

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The unit tests are added

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Metadata

• Fixes #[Link to Issue]

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Latest commit: 2dc9f09

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[tynes]

Thanks for this PR but these contracts are no longer being actively developed

[smartcontracts]

Like @tynes said, we no longer modify the packages/contracts package. I'm going to close this PR, but thank you for opening it!