Switch verification from event-stream based to next-stage based

[bitfriend]

Will implement next generation of verification.

[codecov]

Codecov Report

Attention: Patch coverage is 79.32961% with 74 lines in your changes missing coverage. Please review.

Project coverage is 28.17%. Comparing base (77646d1) to head (d9e1c6a).
Report is 132 commits behind head on main.

Files with missing lines	Patch %	Lines
native/acter/src/api/session_verification.rs	78.10%	74 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2477      +/-   ##
==========================================
+ Coverage   27.81%   28.17%   +0.36%     
==========================================
  Files         657      681      +24     
  Lines       44618    44878     +260     
==========================================
+ Hits        12411    12645     +234     
- Misses      32207    32233      +26     

Flag	Coverage Δ
integration-test	41.60% <79.32%> (+3.62%)	⬆️
unittest	18.43% <ø> (-0.73%)	⬇️

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