feat(rating): add customization to aria-valuetext

[ValentinNelu]

Small PR to add the possibility to change the aria-valuetext in the rating component.

[codecov-commenter]

Codecov Report

Base: 88.66% // Head: 88.68% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (f64918c) compared to base (379dae2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4453      +/-   ##
==========================================
+ Coverage   88.66%   88.68%   +0.01%     
==========================================
  Files         114      114              
  Lines        3998     4003       +5     
  Branches      843      844       +1     
==========================================
+ Hits         3545     3550       +5     
  Misses        413      413              
  Partials       40       40              

Flag	Coverage Δ
e2e	54.52% <ø> (+<0.01%)	⬆️
unit	89.11% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/rating/rating.ts	84.93% <0.00%> (ø)
src/popover/popover.ts	95.12% <0.00%> (ø)
src/tooltip/tooltip.ts	98.57% <0.00%> (ø)
src/util/positioning.ts	100.00% <0.00%> (ø)
src/dropdown/dropdown.ts	91.42% <0.00%> (ø)
src/modal/modal.module.ts	100.00% <0.00%> (ø)
src/typeahead/typeahead.ts	96.35% <0.00%> (ø)
src/datepicker/datepicker.ts	97.97% <0.00%> (ø)
src/progressbar/progressbar.ts	68.18% <0.00%> (ø)
src/datepicker/datepicker-input.ts	95.51% <0.00%> (ø)
... and 2 more

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[maxokorokov]

Hey, @ValentinNelu, thanks!

Added a couple of comments about the API

[maxokorokov]

LGTM, thanks!
Looks much simpler now!

Will merge when CI is green