Adds final state and regression tests

[johnnyt]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.69767% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/sc/parser/scxml/state_stack.ex	60.00%	6 Missing ⚠️
lib/sc/feature_detector.ex	96.61%	2 Missing ⚠️

Files with missing lines	Coverage Δ
lib/sc/document/validator.ex	100.00% <100.00%> (+6.59%)	⬆️
lib/sc/interpreter.ex	88.00% <100.00%> (+0.50%)	⬆️
lib/sc/parser/scxml/element_builder.ex	100.00% <100.00%> (ø)
lib/sc/parser/scxml/handler.ex	100.00% <100.00%> (ø)
lib/sc/feature_detector.ex	96.61% <96.61%> (ø)
lib/sc/parser/scxml/state_stack.ex	88.46% <60.00%> (-3.44%)	⬇️

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