add ReplaySubject

[beeth0ven]

add ReplaySubject

[codecov]

Codecov Report

Merging #27 (1725865) into main (3cb5fdc) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #27   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        15    +1     
  Lines          137       172   +35     
=========================================
+ Hits           137       172   +35     

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

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