add improved supply queries

[joe-bowman]

1. Summary

• add circulating supply calculation to a new module endpoint

2.Type of change

• New feature (non-breaking change which adds functionality)

3. Implementation details

Adds a new API endpoint that determines the current circulating supply.

[faddat]

think this one is ready to rock now

[codecov]

Codecov Report

Merging #809 (b1cac08) into main (5cdf155) will decrease coverage by 0.01%.
The diff coverage is 42.85%.

❗ Current head b1cac08 differs from pull request most recent head b1a9e8e. Consider uploading reports for the commit b1a9e8e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #809      +/-   ##
==========================================
- Coverage   61.93%   61.92%   -0.01%     
==========================================
  Files         172      172              
  Lines       14048    14055       +7     
==========================================
+ Hits         8700     8703       +3     
- Misses       4606     4610       +4     
  Partials      742      742              

Flag	Coverage Δ
unittests	61.92% <42.85%> (-0.01%)	⬇️

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

Files	Coverage Δ
app/modules.go	100.00% <100.00%> (ø)
app/upgrades.go	54.05% <0.00%> (-6.56%)	⬇️