Add addresses to contract artifacts

[abandeali1]

Description

This change is a prerequisite to updating how our migrations work, since we will need to modify and read from the contract artifacts directly.

Testing instructions

Types of changes

Checklist:

• Prefix PR title with [WIP] if necessary.
• Prefix PR title with bracketed package name(s) corresponding to the changed package(s). For example: [sol-cov] Fixed bug.
• Add tests to cover changes as needed.
• Update documentation as needed.
• Add new entries to the relevant CHANGELOG.jsons.

[dekz]

This could probably be cleaned up by just iterating through the enum and building the object. Or is there something else upcoming planned which would prevent this?

[1, 3, 42].reduce((acc, i) => {
    return {
        ...acc,
        [i]: {
            erc20Proxy: (ERC20Proxy as ContractArtifact).networks[i].address,
            erc721Proxy: (ERC721Proxy as ContractArtifact).networks[i].address,
            zrxToken: (ZRXToken as ContractArtifact).networks[i].address,
            etherToken: (WETH9 as ContractArtifact).networks[i].address,
            exchange: (Exchange as ContractArtifact).networks[i].address,
            assetProxyOwner: (AssetProxyOwner as ContractArtifact).networks[i].address,
            forwarder: (Forwarder as ContractArtifact).networks[i].address,
            orderValidator: (OrderValidator as ContractArtifact).networks[i].address,
        },
    };
}, {});