contracts: added test for EIP-155 compatibility

[CedarMist]

Tests that Multicall can be deployed: https://github.com/mds1/multicall

This test will intentionally fail until Sapphire can accept an EIP-155 transaction with no Chain ID (currently it's rejected).

Currently the error is:

• client: transaction check failed: runtime error: module: core code: 1 message: malformed transaction: chain ID None, expected Some(23293)"

[netlify[bot]]

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