refactor: rename components with Element suffix

[kyubisation]

This PR renames the web components with the Element suffix (e.g. SbbAccordion to SbbAccordionElement). This prevents name conflicts when consuming both element and React component (and in the future also Angular component).

[kyubisation]

@DavideMininni-Fincons, @federicoisepponfincons, @dauriamarco, @MarioCastigliano, @TomMenga Jeri convinced me to rename the components with the Element suffix in order to avoid naming conflicts for consumers and also us in the future. I apologize for not discussing and deciding this with the team. We want to create the "final" Lit release today and are pressed for time. Thank you for your understanding (and feel free to voice your grievances in chat 😄).

[jeripeierSBB]

LGTM!

[codecov-commenter]

Codecov Report

Attention: 73 lines in your changes are missing coverage. Please review.

Comparison is base (638977d) 92.61% compared to head (27b023f) 95.99%.
Report is 139 commits behind head on master.

Files	Patch %	Lines
src/components/core/dom/spread.ts	80.48%	8 Missing ⚠️
src/components/icon/icon-base.ts	89.74%	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	95.89%	3 Missing ⚠️
src/components/core/dom/dataset.ts	25.00%	3 Missing ⚠️
src/components/core/dom/host-context.ts	40.00%	3 Missing ⚠️
...onents/core/eventing/connected-abort-controller.ts	40.00%	3 Missing ⚠️
src/components/form-field/form-field/form-field.ts	82.35%	3 Missing ⚠️
src/components/header/header/header.ts	62.50%	3 Missing ⚠️
... and 22 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2275      +/-   ##
==========================================
+ Coverage   92.61%   95.99%   +3.38%     
==========================================
  Files          53      334     +281     
  Lines        2409    39332   +36923     
  Branches      254     2195    +1941     
==========================================
+ Hits         2231    37756   +35525     
- Misses        176     1532    +1356     
- Partials        2       44      +42     

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