add PublishSubject

[beeth0ven]

add PublishSubject

[codecov]

Codecov Report

Merging #25 (a1fc94c) into main (8bf76db) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        13    +2     
  Lines           94       119   +25     
=========================================
+ Hits            94       119   +25     

Impacted Files	Coverage Δ
lib/src/observables/subjects/basic_subject.dart	100.00% <100.00%> (ø)
lib/src/observables/subjects/publish_subject.dart	100.00% <100.00%> (ø)

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