No Filestore On Storage Client

[hannahhoward]

Goals

Remove the need to write a temporary file for the piece on the storage client, who likely does not want to commit extra hard drives space

Implementation

• use an updated version of go-car that can calculate an estimate of car file size without actually writing the car
• calculate the car file size without writing
• write the actual car to an OS.Pipe in a go routine, which is then read when generating commP by the sector builder
• this avoids writing a temporary file other than the one used by OS.Pipe

[laser]

you have my blessings

[codecov-io]

Codecov Report

Merging #107 into master will increase coverage by 0.59%.
The diff coverage is 64.87%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   34.71%   35.29%   +0.59%     
==========================================
  Files          36       36              
  Lines        2706     2726      +20     
==========================================
+ Hits          939      962      +23     
+ Misses       1610     1604       -6     
- Partials      157      160       +3

Impacted Files	Coverage Δ
storagemarket/impl/provider.go	0% <0%> (ø)	⬆️
storagemarket/impl/client.go	0% <0%> (ø)	⬆️
storagemarket/impl/provider_states.go	0% <0%> (ø)	⬆️
storagemarket/impl/client_utils.go	33.9% <0%> (+1.65%)	⬆️
pieceio/pieceio.go	81.97% <75%> (-2.4%)	⬇️

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