Convert label JSON to CBOR

[hannahhoward]

Goals

Shorten the label field by using CBOR

Implementation

Use CBOR instead of json (previously was using different options with JSON encoder to avoid whitespace)

[mikeal]

that’s a codec bug, shouldn’t even be allowed to do that.

[hannahhoward]

@mikeal you should check in with @warpfork about that -- the default DAGJSON encoder in go-ipld-prime does whitespace

[hannahhoward]

anyway, I make this into a CBOR converter instead

[codecov-commenter]

Codecov Report

Merging #393 into master will decrease coverage by 0.05%.
The diff coverage is 62.89%.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
- Coverage   61.89%   61.84%   -0.04%     
==========================================
  Files          43       43              
  Lines        2925     2971      +46     
==========================================
+ Hits         1810     1837      +27     
- Misses        964      981      +17     
- Partials      151      153       +2     

Impacted Files	Coverage Δ
...etrievalmarket/impl/providerstates/provider_fsm.go	8.83% <0.00%> (-1.17%)	⬇️
retrievalmarket/types.go	42.38% <0.00%> (-4.79%)	⬇️
retrievalmarket/impl/client.go	67.46% <36.37%> (+0.79%)	⬆️
retrievalmarket/impl/clientstates/client_fsm.go	72.81% <73.92%> (-1.72%)	⬇️
retrievalmarket/impl/dtutils/dtutils.go	76.67% <75.00%> (+1.67%)	⬆️
retrievalmarket/impl/clientstates/client_states.go	92.78% <91.67%> (-1.89%)	⬇️
retrievalmarket/impl/provider.go	76.99% <100.00%> (+0.19%)	⬆️
storagemarket/impl/clientutils/clientutils.go	79.32% <100.00%> (ø)

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