WIP: emit visitor events

[ssube]

• fixes visitor context hooks #21
• fixes fix untyped flash data #137
• TODO: clean up error messaging
• TODO: add diff messaging

[codecov]

Codecov Report

Merging #163 into master will increase coverage by 0.19%.
The diff coverage is 98.18%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
+ Coverage   97.74%   97.94%   +0.19%     
==========================================
  Files          18       18              
  Lines         311      341      +30     
  Branches       43       45       +2     
==========================================
+ Hits          304      334      +30     
  Misses          2        2              
  Partials        5        5

Impacted Files	Coverage Δ
src/rule/SchemaRule.ts	100% <ø> (ø)	⬆️
src/rule/index.ts	100% <100%> (ø)	⬆️
src/app.ts	100% <100%> (ø)	⬆️
src/utils/index.ts	100% <100%> (ø)	⬆️
src/visitor/VisitorContext.ts	100% <100%> (ø)	⬆️
src/rule/RuleVisitor.ts	97.95% <97.5%> (+2.5%)	⬆️

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