hardhat-migrate v2.5

[Arvolear]

The following features are planned:

• Add a reuse(instance, address, name) operation that adds the contract to the state under the given name but skips the verification namespace.
• Add a config variable to wait x seconds after deployment before verification
• Better error handling (505 blockexplorer)
• BigInt bug
• Expose migrations in tests to be able to test a system's integrity after deployment
• xDeployer integration
• Ability to switch the deployment chain on the fly
• Namespaced migrations
• Automatic migration summary reporting to a file