feat(sbb-stepper): introduce sbb-stepper component

[dauriamarco]

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• I have read the Contributing Guidelines for this project.
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Issue

This PR Closes #2380

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

See Review Guidelines for more information what is checked during review process.

Changes

Changes in this pull request:

• introduces sbb-stepper, sbb-step-label and sbb-step components.

Browsers

I tested the build on the following browsers:

• Firefox Desktop
• Chrome Desktop
• Edge Desktop
• Safari Desktop
• Chrome Mobile
• Safari Mobile

Screen readers

I tested the build on the following browsers:

• JAWS Firefox Desktop
• JAWS Chrome Desktop
• NVDA Firefox Desktop
• NVDA Chrome Desktop
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• VoiceOver Safari Mobile
• Android Accessibility Suite Chrome Mobile

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Does this introduce a breaking change?

• Yes
• No

Other information

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.22%. Comparing base (e6397df) to head (59592be).
Report is 21 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2491      +/-   ##
==========================================
+ Coverage   93.18%   93.22%   +0.03%     
==========================================
  Files         316      316              
  Lines       25389    25324      -65     
  Branches     2063     2065       +2     
==========================================
- Hits        23660    23609      -51     
+ Misses       1696     1682      -14     
  Partials       33       33              

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[jeripeierSBB]

Not really a review, just something missing which was in my mind: please add sbb-stepper to typography.scss where we have the lists of components to hide until defined ("// Hiding components until they are instantiated")

[jeripeierSBB]

Not really a review, just something missing which was in my mind: please add sbb-stepper to typography.scss where we have the lists of components to hide until defined ("// Hiding components until they are instantiated")

Sorry I was mixing it up. Wanted to write this for sbb-overlay ;) stepper should not be part of this list!

[jeripeierSBB]

LGTM :D

[DavideMininni-Fincons]

Some minor details to fix:

• the long label does not wrap in vertical. is it ok? didn't find a Figma sketch for it
• found a weird behavior: on the first story, if i clear the input, than set the focus on the first step, moving with right arrow goes to second step (not sure if it's correct). After that i cant get back to the first one.
• refactored a bit the stories, see https://github.com/sbb-design-systems/lyne-components/compare/chore/stepper-stories?expand=1