Connext Adapter

[jiro-ono]

PR-Codex overview

Detailed summary

• Added lib/interfaces submodule with URL https://github.com/connext/interfaces
• Updated setAddress function in utils/Constants.sol
• Added initAddressLabels function in utils/Constants.sol
• Added forge-gas-snapshot/ and forge-std/ directories to .gitmodules
• Updated .gitmodules with submodule URL https://github.com/connext/interfaces
• Updated test assertions in test/AxelarAdapterTests/AxelarAdapterBridgeTest.t.sol
• Added src/adapters/ConnextAdapter.sol with various imports and contract functions
• Added test/ConnextAdapterTests/ConnextAdapterSwapAndBridgeTest.t.sol with various imports and contract functions

The following files were skipped due to too many changes: test/ConnextAdapterTests/ConnextAdapterSwapAndBridgeTest.t.sol, test/ConnextAdapterTests/ConnextAdapterBridgeTest.t.sol, test/ConnextAdapterTests/ConnextAdapterXReceiveTest.t.sol

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[jiro-ono]

Will need to test it out in live conditions, but seems all good with all the tests for this adapter.