Optimize mempol sort by gp with heap queue

[BananaLF]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #2866 (a848313) into dev (a701f9d) will decrease coverage by 0.19%. The diff coverage is 3.80%.

:exclamation: Current head a848313 differs from pull request most recent head b95a29d. Consider uploading reports for the commit b95a29d to get more accurate results

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@@            Coverage Diff             @@
##              dev    #2866      +/-   ##
==========================================
- Coverage   36.24%   36.06%   -0.19%     
==========================================
  Files         428      434       +6     
  Lines       44860    45089     +229     
==========================================
+ Hits        16261    16262       +1     
- Misses      27425    27652     +227     
- Partials     1174     1175       +1     

Impacted Files	Coverage Δ
x/distribution/keeper/cm45querier.go	0.00% <0.00%> (ø)
x/distribution/keeper/keeper_grpc_adapter.go	0.00% <0.00%> (ø)
x/distribution/keeper/querier.go	68.67% <0.00%> (-1.70%)	:arrow_down:
x/distribution/types/params.go	35.52% <0.00%> (-1.46%)	:arrow_down:
x/distribution/types/querier.go	0.00% <0.00%> (ø)
x/evm/watcher/querier.go	0.00% <ø> (ø)
x/evm/watcher/types.go	39.07% <0.00%> (-0.32%)	:arrow_down:
x/gov/keeper/cm45querier.go	0.00% <0.00%> (ø)
x/gov/keeper/querier.go	76.25% <0.00%> (-2.26%)	:arrow_down:
x/gov/types/cm45_rest_adapter.go	0.00% <0.00%> (ø)
... and 16 more

... and 1 file with indirect coverage changes

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