update go-fil-markets + implement a shared GetChainHead #3880
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This PR makes incremental progress towards this go-fil-markets issue.
Motivation
All chain-querying methods need to be provided a tipset identifier. This will allow
Node*
consumers to issue multiple queries against the same chain state (i.e. the chain's state won't change out from underneath them as the chain's head changes).Proposed changes
This PR updates go-fil-markets to a version in which the node is expected to provide a
GetChainHead
method and provides implementations for various connector structs.