feat(input): add number prop for vmodel casting

[mlmoravek]

Part of #835

Proposed Changes

• Update vue-docgen-cli
• Add dynamic modelValue type defined by number property for o-input component
• Input values are of string type by default, even with type="number". To cast the input value to a number type, the new property number must be set

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[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.

Project coverage is 30.13%. Comparing base (484cfe8) to head (8f0a82d).
Report is 92 commits behind head on develop.

Files	Patch %	Lines
packages/oruga/src/components/input/Input.vue	75.00%	2 Missing and 1 partial ⚠️
...oruga/src/components/autocomplete/Autocomplete.vue	60.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #884       +/-   ##
============================================
- Coverage    56.71%   30.13%   -26.59%     
============================================
  Files           30      295      +265     
  Lines         1511     7685     +6174     
  Branches       544     2137     +1593     
============================================
+ Hits           857     2316     +1459     
- Misses         654     4651     +3997     
- Partials         0      718      +718     

Flag	Coverage Δ
oruga-next	30.13% <78.26%> (-26.59%)	⬇️

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