fix: convert classes on host in data attributes

[dauriamarco]

Avoid setting the class attribute on the host setAttribute(this, 'class'...) and prefer data attributes in order to prevent conflicts with pre-existing classes or classes that need to be toggled.

[jeripeierSBB]

LGTM, please remove console log

[codecov-commenter]

Codecov Report

Attention: 77 lines in your changes are missing coverage. Please review.

Comparison is base (638977d) 92.61% compared to head (2b41fda) 96.02%.
Report is 93 commits behind head on master.

Files	Patch %	Lines
src/components/core/dom/spread.ts	80.48%	8 Missing ⚠️
...nents/core/common-behaviors/slot-child-observer.ts	93.33%	5 Missing ⚠️
src/components/core/dom/breakpoint.ts	42.85%	4 Missing ⚠️
src/components/autocomplete/autocomplete.ts	85.71%	3 Missing ⚠️
src/components/card/card-action/card-action.ts	70.00%	3 Missing ⚠️
src/components/core/dom/dataset.ts	25.00%	3 Missing ⚠️
src/components/core/dom/host-context.ts	40.00%	3 Missing ⚠️
src/components/form-field/form-field/form-field.ts	75.00%	3 Missing ⚠️
src/components/header/header/header.ts	50.00%	3 Missing ⚠️
src/components/image/image.ts	93.33%	3 Missing ⚠️
... and 29 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2242      +/-   ##
==========================================
+ Coverage   92.61%   96.02%   +3.41%     
==========================================
  Files          53      330     +277     
  Lines        2409    39167   +36758     
  Branches      254     2186    +1932     
==========================================
+ Hits         2231    37611   +35380     
- Misses        176     1511    +1335     
- Partials        2       45      +43     

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