Update for go-graphsync v0.8.0

[hannahhoward]

Goals

Good news: The latest version of go-graphync and go-ipld-prime contains an important optimization to remove a bunch of unneccesary hashing when reading from local blockstores, which should cut down significantly on CPU usage
Bad news: The latest versions of these libraries contain a some important, but very breaking changes to syntax.
Good news: I'm updating them all the way to Lotus! And also, in most cases, from the point of view of the consuming libraries, they're simplifications.

Implementation

• Update to go-graphsync v0.8.0 with go-ipld-prime linksystem branch & trusted store.
• Fix syntax changes -- linksystem over loader + storer.

Background

• More about the LinkSystem: introduce LinkSystem ipld/go-ipld-prime#143
• Trusted store branch: Add option to tell link system storage is trusted and we can skip hash on read ipld/go-ipld-prime#149
• PR to merge LinkSystem into go-graphsync: Update for LinkSystem ipfs/go-graphsync#161

[codecov-commenter]

Codecov Report

Merging #3 (428a269) into master (2f0b797) will decrease coverage by 1.57%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   55.68%   54.10%   -1.58%     
==========================================
  Files           3        3              
  Lines         176      146      -30     
==========================================
- Hits           98       79      -19     
+ Misses         63       52      -11     
  Partials       15       15              

Impacted Files	Coverage Δ
store.go	100.00% <100.00%> (ø)
multistore.go	64.51% <0.00%> (-4.30%)	⬇️
mbstore.go	0.00% <0.00%> (ø)

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