Add funds to payment channel before allocating lane #495
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Before retrieving a file, the client must create a payment channel to pay for retrieval. Each deal has a separate lane in the payment channel that is used to manage funds for that particular deal.
The steps are:
If a payment channel already exists in step 1, funds must be added to the existing channel. This PR fixes a bug where the retrieval market state machine would not wait for the add funds message to land on chain before continuing, which caused issues when creating vouchers against the payment channel.