feat: LEAP-1937: Add brush_to_coco format

[robot-ci-heartex]

This PR was automatically generated via Follow Merge. Workflow Run Please ensure that all linked upstream Pull Requests are merged before proceeding with this one.

• https://github.com/HumanSignal/label-studio-sdk/pull/432

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.91%. Comparing base (94cf8b4) to head (21a83b1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #362   +/-   ##
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  Coverage   70.91%   70.91%           
=======================================
  Files          50       50           
  Lines        2953     2953           
=======================================
  Hits         2094     2094           
  Misses        859      859           

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