Add StorageDealAwaitingPreCommit state

[dirkmc]

Markets side of filecoin-project/lotus#4900

[nonsense]

I am still very new to this code, but overall looks good to me!

[hannahhoward]

It is actually important to move the new deal state to the bottom of the list -- otherwise you need to write a migration for deal states. It's no worries -- I'll do it for you and merge, just a heads up.

[codecov-io]

Codecov Report

Merging #453 (856abb6) into master (68ed456) will increase coverage by 0.44%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
+ Coverage   65.01%   65.45%   +0.44%     
==========================================
  Files          46       46              
  Lines        3152     3192      +40     
==========================================
+ Hits         2049     2089      +40     
  Misses        871      871              
  Partials      232      232              

Impacted Files	Coverage Δ
storagemarket/types.go	0.00% <ø> (ø)
storagemarket/impl/clientstates/client_fsm.go	85.58% <100.00%> (+1.21%)	⬆️
storagemarket/impl/clientstates/client_states.go	89.93% <100.00%> (+0.96%)	⬆️
storagemarket/impl/providerstates/provider_fsm.go	73.95% <100.00%> (+2.14%)	⬆️
...oragemarket/impl/providerstates/provider_states.go	84.20% <100.00%> (+0.67%)	⬆️

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[nonsense]

It is actually important to move the new deal state to the bottom of the list -- otherwise you need to write a migration for deal states.

Right, this was going to offset a lot of states, including StorageDealActive, so we would have messed up the state of the client with respect to pretty much all deals. Good catch!