fix: eventbus cork should support reentry

[killagu]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov]

Codecov Report

Base: 92.91% // Head: 92.91% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (874dd38) compared to base (9fb155b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   92.91%   92.91%           
=======================================
  Files         217      217           
  Lines        4543     4544    +1     
  Branches      471      472    +1     
=======================================
+ Hits         4221     4222    +1     
  Misses        322      322           

Impacted Files	Coverage Δ
core/eventbus-decorator/src/EventBus.ts	100.00% <ø> (ø)
core/eventbus-runtime/src/SingletonEventBus.ts	85.05% <100.00%> (+0.17%)	⬆️
plugin/eventbus/lib/EggContextEventBus.ts	100.00% <100.00%> (ø)

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