feat: individual reward bands per denom

[adamewozniak]

Description

closes: #95

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Author Checklist

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

Codecov Report

Merging #98 (3e16ca8) into main (0b56c97) will increase coverage by 0.01%.
The diff coverage is 18.58%.

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@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   17.11%   17.12%   +0.01%     
==========================================
  Files          40       41       +1     
  Lines       10658    10895     +237     
==========================================
+ Hits         1824     1866      +42     
- Misses       8746     8937     +191     
- Partials       88       92       +4     

Impacted Files	Coverage Δ
x/oracle/keeper/params.go	64.28% <0.00%> (ø)
x/oracle/types/oracle.pb.go	0.49% <0.48%> (+<0.01%)	⬆️
x/oracle/abci.go	76.69% <57.14%> (-1.88%)	⬇️
x/oracle/types/params.go	81.72% <81.25%> (-0.50%)	⬇️
x/oracle/types/reward_band.go	86.36% <86.36%> (ø)

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