Extending Signal's API

[CarLeonDev]

• Add Computed
• Add Effect
• Testing
• Add documentation about it

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 37.28814% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.61%. Comparing base (c664f06) to head (6943242).

Files with missing lines	Patch %	Lines
...actter/lib/src/signal/internal/signal_runtime.dart	33.33%	14 Missing ⚠️
packages/reactter/lib/src/signal/computed.dart	0.00%	11 Missing ⚠️
...tter/lib/src/signal/internal/state_subscriber.dart	0.00%	8 Missing ⚠️
packages/reactter/lib/src/signal/effect.dart	0.00%	4 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##            master       #7      +/-   ##
===========================================
- Coverage   100.00%   97.61%   -2.39%     
===========================================
  Files           50       55       +5     
  Lines         1512     1551      +39     
===========================================
+ Hits          1512     1514       +2     
- Misses           0       37      +37     

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