feat: implement MaxSupplyUtilization

[toteki]

Description

closes: #1162

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Author Checklist

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• confirmed the correct type prefix in the PR title
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• reviewed tests and test coverage
• manually tested (if applicable)

[codecov-commenter]

Codecov Report

Merging #1330 (fc5b041) into adam/c1 (2f812a4) will increase coverage by 0.06%.
The diff coverage is 78.57%.

@@             Coverage Diff             @@
##           adam/c1    #1330      +/-   ##
===========================================
+ Coverage    51.88%   51.94%   +0.06%     
===========================================
  Files           69       69              
  Lines         6748     6770      +22     
===========================================
+ Hits          3501     3517      +16     
- Misses        2976     2980       +4     
- Partials       271      273       +2     

Impacted Files	Coverage Δ
x/leverage/keeper/keeper.go	65.23% <50.00%> (-0.89%)	⬇️
x/leverage/keeper/borrows.go	79.09% <100.00%> (ø)
x/leverage/keeper/grpc_query.go	63.44% <100.00%> (+2.29%)	⬆️

[toteki]

Note: Merge #1329 before this

[robert-zaremba]

LGTM.