feat: Add set state method

[erikzenker]

[codecov-commenter]

Codecov Report

Merging #176 (b888a5b) into master (3f83bda) will decrease coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head b888a5b differs from pull request most recent head d80d3c5. Consider uploading reports for the commit d80d3c5 to get more accurate results

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
- Coverage   97.79%   97.78%   -0.01%     
==========================================
  Files          81       80       -1     
  Lines        1132     1130       -2     
==========================================
- Hits         1107     1105       -2     
  Misses         25       25              

Impacted Files	Coverage Δ
test/integration/chain_actions.cpp	100.00% <ø> (ø)
test/integration/entry_exit_actions.cpp	100.00% <ø> (ø)
test/integration/guards_actions.cpp	100.00% <ø> (ø)
test/integration/internal_transition.cpp	88.88% <ø> (ø)
include/hsm/details/sm.h	100.00% <100.00%> (ø)
test/integration/set_state.cpp	100.00% <100.00%> (ø)
test/integration/dependency_injection.cpp	100.00% <0.00%> (ø)
test/unit/collect_initial_states_tests.cpp	100.00% <0.00%> (ø)
include/hsm/details/collect_initial_states.h	100.00% <0.00%> (ø)
... and 3 more

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