melos setup #1: initial set up and start with dart package

[buenaflor]

📜 Description

Setting up melos PR #1 and we will start off with migrating the dart package

PR will be merged into umbrella/melos branch

💡 Motivation and Context

Easier local development

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.66%. Comparing base (f761369) to head (c692b29).
⚠️ Report is 1 commits behind head on umbrella/melos.

Additional details and impacted files

@@               Coverage Diff               @@
##           umbrella/melos    #3117   +/-   ##
===============================================
  Coverage           87.66%   87.66%           
===============================================
  Files                 288      288           
  Lines                9813     9813           
===============================================
  Hits                 8603     8603           
  Misses               1210     1210           

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[denrase]

Do you knwo why packages was previously in gitignore?

[buenaflor]

this was added 8 years ago, so it might have been some Dart/Flutter specific thing that was still an issue back then.

today packages is used a lot, e.g https://github.com/flame-engine/flame/

[denrase]

CI is green and this is against a separate branch, so should be good to proceed.