feat(marketplace): SellOrders query & sub-queries

[technicallyty]

Description

• adds all SellOrders queries

ref: #856

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[technicallyty]

put both the SellOrdersBy... queries in the same file, seemed like a sane thing to do as they're essentially SellOrders sub-queries, but can move them to separate files if that makes more sense

[codecov]

Codecov Report

Merging #917 (dcc5dc7) into master (07371fb) will decrease coverage by 6.93%.
The diff coverage is 54.54%.

❗ Current head dcc5dc7 differs from pull request most recent head 25387f3. Consider uploading reports for the commit 25387f3 to get more accurate results

@@            Coverage Diff             @@
##           master     #917      +/-   ##
==========================================
- Coverage   72.64%   65.71%   -6.94%     
==========================================
  Files         185      179       -6     
  Lines       22742    20282    -2460     
==========================================
- Hits        16522    13329    -3193     
- Misses       4994     5800     +806     
+ Partials     1226     1153      -73     

Flag	Coverage Δ
experimental-codecov	?
stable-codecov	65.71% <54.54%> (+<0.01%)	⬆️

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[ryanchristo]

Looks good to me. A couple nits with import names and maybe a test case using pagination would be nice. Pre-approving.