fix: increase price calc precision for high exponent assets

[toteki]

Description

Affects QueryMarketSummary for frontend as well as some leverage calculations internally. See changelog.

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Author Checklist

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I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
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• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
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Reviewers Checklist

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I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov-commenter]

Codecov Report

Merging #1633 (8af5a0c) into main (c11c191) will increase coverage by 0.05%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##             main    #1633      +/-   ##
==========================================
+ Coverage   54.05%   54.11%   +0.05%     
==========================================
  Files          71       71              
  Lines        7150     7194      +44     
==========================================
+ Hits         3865     3893      +28     
- Misses       2988     3000      +12     
- Partials      297      301       +4     

Impacted Files	Coverage Δ
x/leverage/keeper/limits.go	13.88% <0.00%> (-1.74%)	⬇️
x/leverage/keeper/oracle.go	64.13% <71.42%> (+1.05%)	⬆️
x/leverage/keeper/liquidate.go	82.58% <82.35%> (-0.45%)	⬇️
x/leverage/client/tests/tests.go	100.00% <100.00%> (ø)
x/leverage/keeper/grpc_query.go	62.68% <100.00%> (ø)

[robert-zaremba]

pre-approving. Let's make sure we have all "zero" checks in place.