feat(api-http): add /contracts endpoint with common contracts

[oXtxNt9U]

Summary

{
    "consensus": {
        "address": "0x535B3D7A252fa034Ed71F0C53ec0C6F784cB64E1",
        "proxy": "UUPS",
        "implementations": [
            "0x522B3294E6d06aA25Ad0f1B8891242E335D3B459",
        ],
        "activeImplementation": "0x522B3294E6d06aA25Ad0f1B8891242E335D3B459"
    },
    "multi-payments": {
        "address": "0x83769BeEB7e5405ef0B7dc3C66C43E3a51A6d27f",
        "proxy": null,
        "implementations": [
            "0x83769BeEB7e5405ef0B7dc3C66C43E3a51A6d27f"
        ],
        "activeImplementation": "0x83769BeEB7e5405ef0B7dc3C66C43E3a51A6d27f"
    },
    "usernames": {
        "address": "0x2c1DE3b4Dbb4aDebEbB5dcECAe825bE2a9fc6eb6",
        "proxy": "UUPS",
        "implementations": [
            "0xc051134F56d56160E8c8ed9bB3c439c78AB27cCc"
        ],
        "activeImplementation": "0xc051134F56d56160E8c8ed9bB3c439c78AB27cCc"
    }
}

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged