feat(ecocredit/core): dynamic batch minting

[technicallyty]

Description

• implements dynamic batch minting server impl
• refactors calls to fetch credit balances into a util that handles Not Found cases.
• implements tests for the added util and the existing util functions

ref: #973

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

Codecov Report

Merging #1059 (6a2b6b1) into master (064955a) will decrease coverage by 6.18%.
The diff coverage is 60.86%.

@@            Coverage Diff             @@
##           master    #1059      +/-   ##
==========================================
- Coverage   69.00%   62.82%   -6.19%     
==========================================
  Files         218      215       -3     
  Lines       21276    19449    -1827     
==========================================
- Hits        14682    12219    -2463     
- Misses       5267     5953     +686     
+ Partials     1327     1277      -50     

Flag	Coverage Δ
experimental-codecov	?
stable-codecov	62.82% <60.86%> (-0.11%)	⬇️

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[ryanchristo]

Looking good. A few questions and some minor suggestions.

[ryanchristo]

Looks good to me.

[aleem1314]

lgtm

[ryanchristo]

@technicallyty looks like the merge caused duplicate imports. Can you fix? 🙏