LayerZero-Labs/LayerZero-v2

Expose constants for 3rd parties

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Some important constants used in the LZ public API aren't exposed by LZ Solidity files. For example CONFIG_TYPE_ULN and NIL_DVN_COUNT are internal despite being crucial when calling IMessageLibManager.setConfig from a smart contract.

LayerZero-v2/messagelib/test/util/Constant.sol is a great resource, maybe it could be moved out of the scary test directory? It could be used in the contracts as the source of constants.