fix(tier): grpc codec issue with decimal field in response message

[cosmic-vagabond]

grpc codec issue with decimal field in response message in tier module

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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
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
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Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• 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)

Deployment Notes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.63%. Comparing base (e667c23) to head (2692578).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1072      +/-   ##
==========================================
- Coverage   45.63%   45.63%   -0.01%     
==========================================
  Files         953      953              
  Lines       36486    36488       +2     
==========================================
  Hits        16652    16652              
- Misses      18528    18530       +2     
  Partials     1306     1306              

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