feat: async builds

[schultek]

Description

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• 📝 Documentation
• 🗑️ Chore

Ready Checklist

• I've read the Contribution Guide.
• In case this PR changes one of the core packages, I've modified the respective CHANGELOG.md file using
  the semantic_changelog format.
• I updated/added relevant documentation (doc comments with ///).

If you need help, consider asking for advice on the #contribute channel on Discord.

[docs-page]

To view this pull requests documentation preview, visit the following URL:

docs.page/schultek/jaspr~103

Documentation is deployed and generated using docs.page.

[github-actions]

Package Version Report

No packages have been updated.

[codecov]

Codecov Report

Patch coverage: 14.28% and project coverage change: -2.84% ⚠️

Comparison is base (d9be6e6) 66.93% compared to head (a8bcef3) 64.10%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   66.93%   64.10%   -2.84%     
==========================================
  Files          96       86      -10     
  Lines        3774     3468     -306     
==========================================
- Hits         2526     2223     -303     
+ Misses       1248     1245       -3     

Files Changed	Coverage Δ
packages/jaspr/lib/src/foundation/sync.dart	15.62% <ø> (-12.25%)	⬇️
...s/jaspr/lib/src/framework/multi_child_element.dart	90.43% <0.00%> (-0.80%)	⬇️
...es/jaspr/lib/src/framework/stateful_component.dart	82.40% <ø> (-2.40%)	⬇️
packages/jaspr/lib/src/framework/build_owner.dart	81.35% <15.38%> (-10.24%)	⬇️

... and 24 files with indirect coverage changes

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