feat(sbb-dialog): add backdropAction property

[dauriamarco]

Closes #2003

[codecov-commenter]

Codecov Report

Merging #2028 (95ffb56) into master (ab917b0) will decrease coverage by 18.21%.
Report is 1716 commits behind head on master.
The diff coverage is 30.54%.

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@@             Coverage Diff             @@
##           master    #2028       +/-   ##
===========================================
- Coverage   54.85%   36.64%   -18.21%     
===========================================
  Files          49      288      +239     
  Lines        1659    10913     +9254     
  Branches      406     2388     +1982     
===========================================
+ Hits          910     3999     +3089     
- Misses        671     6654     +5983     
- Partials       78      260      +182     

Files	Coverage Δ
...c/components/sbb-action-group/sbb-action-group.tsx	100.00% <100.00%> (ø)
...mponents/sbb-alert-group/sbb-alert-group.events.ts	100.00% <100.00%> (ø)
src/components/sbb-alert/sbb-alert.events.ts	100.00% <100.00%> (ø)
...onents/sbb-autocomplete/sbb-autocomplete.events.ts	100.00% <ø> (ø)
src/components/sbb-card-badge/sbb-card-badge.tsx	100.00% <100.00%> (+11.11%)	⬆️
src/components/sbb-card/sbb-card.stories.tsx	0.00% <ø> (ø)
src/components/sbb-card/sbb-card.tsx	90.00% <ø> (ø)
.../sbb-checkbox-group/sbb-checkbox-group.stories.tsx	0.00% <ø> (ø)
...mponents/sbb-checkbox-group/sbb-checkbox-group.tsx	33.33% <ø> (ø)
src/components/sbb-checkbox/sbb-checkbox.events.ts	0.00% <ø> (ø)
... and 55 more

... and 239 files with indirect coverage changes

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[kyubisation]

LGTM 👍
One improvement