renaming hashFunction

[kalote]

What kind of change does this PR introduce (bug fix, feature, docs update, ...)?

• Rename hashFunction to verificationFunction
• Rename hash to verificationData
• Rename some function names for consistency
• Rename some variables names for consistency
• Rename some constants for consistency

What is the current behaviour (you can also link to an open issue here)?

What is the new behaviour (if this is a feature change)?

same behaviour, different variable names

Other information:

[codecov-commenter]

Codecov Report

Merging #333 (a7c60d0) into develop (122efa9) will increase coverage by 0.85%.
Report is 84 commits behind head on develop.
The diff coverage is 90.24%.

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@@             Coverage Diff             @@
##           develop     #333      +/-   ##
===========================================
+ Coverage    83.04%   83.89%   +0.85%     
===========================================
  Files           18       18              
  Lines          979     1124     +145     
  Branches       218      252      +34     
===========================================
+ Hits           813      943     +130     
- Misses          91       97       +6     
- Partials        75       84       +9     

Files	Coverage Δ
src/constants/constants.ts	100.00% <100.00%> (ø)
src/constants/interfaces.ts	100.00% <100.00%> (ø)
src/index.ts	77.22% <100.00%> (+0.22%)	⬆️
src/lib/detector.ts	96.00% <100.00%> (+8.50%)	⬆️
src/lib/getData.ts	89.79% <ø> (ø)
src/lib/getDataFromExternalSources.ts	63.33% <ø> (-1.19%)	⬇️
src/lib/provider-wrapper-utils.ts	88.88% <ø> (-0.59%)	⬇️
src/schemas/index.ts	100.00% <100.00%> (ø)
src/types/Method.ts	100.00% <100.00%> (ø)
src/lib/decodeMappingKey.ts	84.21% <60.00%> (-5.54%)	⬇️
... and 4 more

... and 3 files with indirect coverage changes