ci: improve speed and refactor

[buenaflor]

📜 Description

Improves CI speed by splitting up into multiple jobs and not using build on the whole project.

#skip-changelog

💡 Motivation and Context

Closes #142

💚 How did you test it?

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e7bbfd) 77.83% compared to head (2a54a8c) 77.83%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #147   +/-   ##
=======================================
  Coverage   77.83%   77.83%           
=======================================
  Files          27       27           
  Lines         424      424           
  Branches       55       55           
=======================================
  Hits          330      330           
  Misses         68       68           
  Partials       26       26           

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[brustolin]

LGTM