feat: add fill flux

[Andy2003]

Proposed Changes

Add FillFlux function.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #376 (b81b7ec) into master (b81b7ec) will not change coverage.
The diff coverage is n/a.

❗ Current head b81b7ec differs from pull request most recent head a300986. Consider uploading reports for the commit a300986 to get more accurate results

@@            Coverage Diff            @@
##             master     #376   +/-   ##
=========================================
  Coverage     89.61%   89.61%           
  Complexity      721      721           
=========================================
  Files           166      166           
  Lines          6574     6574           
  Branches        326      326           
=========================================
  Hits           5891     5891           
  Misses          591      591           
  Partials         92       92           

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[bednar]

Thanks for your PR 👍

LGTM 🚀