made onEvent functions suspend

[RealYusufIsmail]

Pull Request Etiquette

• I have checked the PRs for upcoming features/bug fixes.
• I have read the code of conduct.

Changes

• Internal code
• Library interface (affecting end-user code)
• Documentation
• Other: _____

Closes : #168

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.63% ⚠️

Comparison is base (476f492) 1.63% compared to head (d74da9b) 1.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             master    #172      +/-   ##
===========================================
- Coverage      1.63%   1.00%   -0.63%     
+ Complexity       15       8       -7     
===========================================
  Files           197     197              
  Lines          3188    3194       +6     
  Branches        311     311              
===========================================
- Hits             52      32      -20     
- Misses         3132    3161      +29     
+ Partials          4       1       -3     

Files Changed	Coverage Δ
...ydwk/evm/backend/managers/CoroutineEventManager.kt	10.71% <0.00%> (-30.03%)	⬇️
...wk/ydwk/evm/backend/managers/SampleEventManager.kt	11.76% <ø> (-17.65%)	⬇️
...c/main/kotlin/io/github/ydwk/ydwk/impl/YDWKImpl.kt	14.40% <0.00%> (-7.72%)	⬇️

... and 1 file with indirect coverage changes

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