feat: add dangerouslyGetParent

[osdnk]

No description provided.

[codecov-io]

Codecov Report

Merging #62 into master will decrease coverage by 0.32%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   92.41%   92.08%   -0.33%     
==========================================
  Files          27       27              
  Lines         501      493       -8     
  Branches      115      113       -2     
==========================================
- Hits          463      454       -9     
- Misses         33       34       +1     
  Partials        5        5

Impacted Files	Coverage Δ
packages/core/src/useNavigationCache.tsx	100% <100%> (ø)	⬆️
...ges/core/src/__tests__/__fixtures__/MockRouter.tsx	84.84% <0%> (-3.04%)	⬇️
packages/core/src/NavigationContainer.tsx	88.05% <0%> (-0.35%)	⬇️
packages/core/src/useDevTools.tsx	57.14% <0%> (ø)	⬆️
packages/core/src/useNavigationHelpers.tsx	100% <0%> (ø)	⬆️
packages/core/src/useNavigationBuilder.tsx	100% <0%> (ø)	⬆️
packages/core/src/getStateFromPath.tsx	100% <0%> (ø)	⬆️

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[satya164]

I think this should be navigation, not parentNavigation. Reading the React navigation docs, this refers to the navigation object of the navigator.