fix(x/ecocredit): readable marketplace query responses

[ryanchristo]

Description

Closes: #1028

Add SellOrderInfo with human-readable fields (including ask_denom) and update query implementation.

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Author Checklist

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• confirmed the correct type prefix in the PR title
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[codecov]

Codecov Report

Merging #1054 (ef95b7b) into master (e4e9a15) will increase coverage by 0.14%.
The diff coverage is 89.55%.

@@            Coverage Diff             @@
##           master    #1054      +/-   ##
==========================================
+ Coverage   68.77%   68.91%   +0.14%     
==========================================
  Files         222      223       +1     
  Lines       21338    21412      +74     
==========================================
+ Hits        14676    14757      +81     
+ Misses       5340     5336       -4     
+ Partials     1322     1319       -3     

Flag	Coverage Δ
experimental-codecov	68.82% <89.55%> (+0.04%)	⬆️
stable-codecov	62.87% <89.55%> (?)

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[technicallyty]

lgtm 👍🏻

[aleem1314]

lgtm