feat(sdk): add trader v3 with gomu order book #17
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Add a trader v3 marketplace (mostly copied from trader v4) that uses the gomu order book.
Right now, the order book is a simple CRUD backend that is not monitoring events from the chain. For simplicity, we could post status updates to the order book after confirmation from ethers after cancelling and taking (but isn't done so in this PR).
What is more important is the query pattern required to fetch orders. Right now I only have a very simple query params of maker address, maker asset, taker address, taker asset. We'll probably need an active, cancelled, expired status, which I can add next. Let me know what else is required.