Port "light-client: Optimize voting power calculation by breaking the loop when we have enough voting power" (tendermint-rs#1395)

[romac]

Closes: #19

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@03974f5). Click here to learn what that means.

❗ Current head 365a91e differs from pull request most recent head 995386f. Consider uploading reports for the commit 995386f to get more accurate results

Additional details and impacted files

@@          Coverage Diff           @@
##             main     #25   +/-   ##
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  Coverage        ?   57.1%           
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  Files           ?     254           
  Lines           ?   27587           
  Branches        ?       0           
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  Hits            ?   15766           
  Misses          ?   11821           
  Partials        ?       0           

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