feat(sbb-toggle-check): add new size variant (M)

[dauriamarco]

Closes #1846

[codecov-commenter]

Codecov Report

Merging #1849 (78ee391) into master (ab917b0) will decrease coverage by 17.42%.
The diff coverage is 34.45%.

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@@             Coverage Diff             @@
##           master    #1849       +/-   ##
===========================================
- Coverage   54.85%   37.44%   -17.42%     
===========================================
  Files          49      257      +208     
  Lines        1659     9834     +8175     
  Branches      406     2119     +1713     
===========================================
+ Hits          910     3682     +2772     
- Misses        671     5885     +5214     
- Partials       78      267      +189     

Impacted Files	Coverage Δ
...ts/sbb-accordion-item/sbb-accordion-item.events.ts	100.00% <ø> (ø)
.../sbb-accordion-item/sbb-accordion-item.stories.tsx	0.00% <0.00%> (ø)
...mponents/sbb-accordion-item/sbb-accordion-item.tsx	0.00% <0.00%> (-37.21%)	⬇️
...components/sbb-accordion/sbb-accordion.stories.tsx	0.00% <0.00%> (ø)
...ents/sbb-action-group/sbb-action-group.stories.tsx	0.00% <0.00%> (ø)
...onents/sbb-alert-group/sbb-alert-group.stories.tsx	0.00% <0.00%> (ø)
src/components/sbb-alert/sbb-alert.stories.tsx	0.00% <0.00%> (ø)
...onents/sbb-autocomplete/sbb-autocomplete.events.ts	100.00% <ø> (ø)
...ents/sbb-autocomplete/sbb-autocomplete.stories.tsx	0.00% <0.00%> (ø)
src/components/sbb-button/sbb-button.stories.tsx	0.00% <0.00%> (ø)
... and 58 more

... and 201 files with indirect coverage changes

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[kyubisation]

LGTM 👍
Let's have @mcilurzo also take a look at it.

[jeripeierSBB]

LGTM