feat(Stepper): add loading prop & automatic render for non-custom stepper

[lukicenturi]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (fd9974a) 60.85% compared to head (ad79e36) 60.80%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/components/steppers/Stepper.stories.ts	0.00%	11 Missing ⚠️
src/components/steppers/Stepper.vue	74.07%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   60.85%   60.80%   -0.05%     
==========================================
  Files          78       78              
  Lines       13142    13184      +42     
  Branches      436      437       +1     
==========================================
+ Hits         7998     8017      +19     
- Misses       5144     5167      +23     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kelsos]

lgtm