feat(x/ecocredit): query all credit holders

[technicallyty]

Description

• adds a query that gets all credit holders w/ their balances

this is a simplified query as doing sorting/consolidating of balances based on address would make behavior with pagination be a bit too wonky, and in some cases could slow down a node.

Closes: #1110

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Author Checklist

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please add links to any relevant follow up issues.

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
• 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
• confirmed all CI checks have passed

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)

[codecov]

Codecov Report

Merging #1416 (2561076) into main (fbde113) will decrease coverage by 0.09%.
The diff coverage is 61.17%.

@@            Coverage Diff             @@
##             main    #1416      +/-   ##
==========================================
- Coverage   78.67%   78.58%   -0.10%     
==========================================
  Files         235      236       +1     
  Lines       18053    18127      +74     
==========================================
+ Hits        14204    14245      +41     
- Misses       3052     3074      +22     
- Partials      797      808      +11     

Impacted Files	Coverage Δ
x/ecocredit/migrations/v3/state.go	47.50% <44.44%> (-27.50%)	⬇️
x/ecocredit/server/core/query_all_balances.go	50.00% <50.00%> (ø)
x/ecocredit/client/testsuite/grpc.go	100.00% <100.00%> (ø)

[ryanchristo]

tACK