feat: Add bool return trype to process event

[erikzenker]

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[codecov-commenter]

Codecov Report

Merging #172 (5c78881) into master (fe5461d) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   97.75%   97.74%   -0.01%     
==========================================
  Files          78       78              
  Lines        1114     1111       -3     
==========================================
- Hits         1089     1086       -3     
  Misses         25       25              

Impacted Files	Coverage Δ
test/integration/unexpected_event_handler.cpp	100.00% <ø> (ø)
include/hsm/details/sm.h	100.00% <100.00%> (ø)

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