Record data transfer errors

[hannahhoward]

Goals

• Provide more information in deals about the state of disconnects

Implementation

• in storage market, record an error when data transfer stalls
• in retrieval market, cause we have no restarts (yet), fail when data transfer stalls

[aarshkshah1992]

LGTM !

[codecov-io]

Codecov Report

Merging #432 into master will decrease coverage by 0.20%.
The diff coverage is 36.37%.

@@            Coverage Diff             @@
##           master     #432      +/-   ##
==========================================
- Coverage   65.75%   65.55%   -0.19%     
==========================================
  Files          48       48              
  Lines        3252     3274      +22     
==========================================
+ Hits         2138     2146       +8     
- Misses        865      877      +12     
- Partials      249      251       +2     

Impacted Files	Coverage Δ
storagemarket/impl/clientstates/client_fsm.go	86.46% <0.00%> (-4.75%)	⬇️
storagemarket/impl/providerstates/provider_fsm.go	76.20% <0.00%> (-3.80%)	⬇️
storagemarket/impl/dtutils/dtutils.go	64.71% <50.00%> (-1.96%)	⬇️
retrievalmarket/impl/dtutils/dtutils.go	78.31% <100.00%> (+0.86%)	⬆️

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