feat: allow query validator-historical-rewards for distribution

[mmsqe]

Description

These queries enable debugging reward calculations by allowing user to inspect internal distribution state without exporting genesis at specific heights. User can query delegator-starting-info to get the previous period and stake, then use validator-historical-rewards with that period to retrieve cumulative reward ratios for accurate reward verification.

[codecov]

Codecov Report

❌ Patch coverage is 91.46341% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.24%. Comparing base (70e615c) to head (7e3eacc).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
x/distribution/keeper/grpc_query.go	87.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25650      +/-   ##
==========================================
+ Coverage   68.21%   68.24%   +0.02%     
==========================================
  Files         894      894              
  Lines       58161    58243      +82     
==========================================
+ Hits        39674    39747      +73     
- Misses      18487    18496       +9     

Files with missing lines	Coverage Δ
contrib/x/nft/module/module.go	0.00% <ø> (ø)
testutil/configurator/configurator.go	80.42% <ø> (ø)
x/distribution/autocli.go	100.00% <100.00%> (ø)
x/distribution/keeper/grpc_query.go	81.42% <87.50%> (+1.72%)	⬆️

... and 2 files with indirect coverage changes

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[aljo242]

@mmsqe just one CI check failing