Switch to cbor map encoding for storage market

[hannahhoward]

Goals

• Move all storage data structures to CBOR Map encoding
• Setup transparent migrations (continue to implement ds-versioning)
• Don't break network protocols -- continue to support old versions (for now) -- as an exercise in proving how to do non breaking upgrades

Implementation

• First setup all migrations, similar to style of migrations in piecestore
• Setup and test client and provider for storage to work with versioned datastores
• Also migrate the StoredAsk data structure
• Move around the test harness so the code is shared
• Setup all protocols (ask, deals, deal status) to accept multiple stream options for both versions of protocol
• We have to change some signatures for the network streams cause they have signatures -- unfortunately, the signature on a tuple struct is different than a map encoded one... so the signature bytes actually change. We pass in a resigning function for write functions (we can re-sign cause we know our own key), and we return the original bytes for read functions (we cannot resign, cause it's the other party's data structure -- be can vouch for the fact that the original bytes, if they match the signature, do match the return unsigned map-encoded structure in terms of parameters
• Add options to disable various networking options so we can test and verify our changes work

[codecov-commenter]

Codecov Report

Merging #420 into master will increase coverage by 3.53%.
The diff coverage is 72.96%.

@@            Coverage Diff             @@
##           master     #420      +/-   ##
==========================================
+ Coverage   62.50%   66.02%   +3.53%     
==========================================
  Files          45       48       +3     
  Lines        2949     3178     +229     
==========================================
+ Hits         1843     2098     +255     
+ Misses        910      846      -64     
- Partials      196      234      +38     

Impacted Files	Coverage Δ
storagemarket/impl/provider_environments.go	0.00% <0.00%> (ø)
storagemarket/types.go	0.00% <ø> (ø)
storagemarket/network/ask_stream.go	47.06% <33.34%> (-6.78%)	⬇️
storagemarket/network/deal_status_stream.go	50.00% <40.00%> (-3.84%)	⬇️
storagemarket/network/deal_stream.go	50.00% <40.00%> (-3.84%)	⬇️
storagemarket/impl/client.go	20.47% <46.43%> (+18.85%)	⬆️
storagemarket/impl/provider.go	23.42% <54.17%> (+21.73%)	⬆️
storagemarket/impl/clientstates/client_states.go	87.03% <60.00%> (-1.25%)	⬇️
storagemarket/impl/storedask/storedask.go	76.25% <60.00%> (-2.32%)	⬇️
storagemarket/network/legacy_ask_stream.go	75.00% <75.00%> (ø)
... and 9 more

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[ingar]

Migrate FTW.