Handle payment chanel ready to go

[hannahhoward]

Goals

This is a companion PR to filecoin-project/lotus#7883 to remove hacky code from the RetrievalClientAdapter.

It enables that code to run without changes but support the new pre-funding the payment channel manager

Implementation

• if GetOrCreatePaymentChannel returns a cid.Undef for the msgCID, treat it as ready to go

[codecov-commenter]

Codecov Report

Merging #677 (e360fa1) into master (8d45bb7) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #677      +/-   ##
==========================================
- Coverage   59.81%   59.68%   -0.13%     
==========================================
  Files          64       64              
  Lines        5260     5262       +2     
==========================================
- Hits         3146     3140       -6     
- Misses       1782     1790       +8     
  Partials      332      332              

Impacted Files	Coverage Δ
retrievalmarket/impl/clientstates/client_fsm.go	66.93% <ø> (ø)
retrievalmarket/impl/clientstates/client_states.go	95.32% <100.00%> (+0.08%)	⬆️
retrievalmarket/events.go	0.00% <0.00%> (-80.00%)	⬇️
retrievalmarket/dealstatus.go	0.00% <0.00%> (-80.00%)	⬇️

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