feat(marketplace): QuerySellOrder ORM

[technicallyty]

Description

• adds query endpoint for single sell order

ref: #856

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #906 (3bc98ca) into master (845be98) will decrease coverage by 0.00%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #906      +/-   ##
==========================================
- Coverage   73.32%   73.32%   -0.01%     
==========================================
  Files         170      171       +1     
  Lines       22486    22493       +7     
==========================================
+ Hits        16488    16493       +5     
- Misses       4835     4836       +1     
- Partials     1163     1164       +1     

Flag	Coverage Δ
experimental-codecov	73.29% <71.42%> (+0.03%)	⬆️
stable-codecov	66.52% <71.42%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[ryanchristo]

Looks good to me.