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Continue to load links synchronously after network request completes

Async loader returns a single channel result type

Create a cache to manager how to track how long to keep unverified blocks around

Create an in memory object for storing blocks received from the server temporarily

Create async loader to handle multiple load attempts as responses come in from network

Convert GraphSyncRequest and GraphSyncResponse to structs, track by value, pass directly into add
methods on GraphSyncMessage

Handle failed request status codes from server and pass on errors

Cleanup request manager test to extract repeated code

Add a channel of asynchronous errors instead of only an initial synchronous one

Create a manager for outgoing requests