feat: add OnCloseAsync/OnConfirmAsync callback on SwalAlert component

[ArgoZhang]

add OnCloseAsync/OnConfirmAsync callback on SwalAlert component

Description

close #567

[codecov]

Codecov Report

Merging #568 (85ba9f9) into main (5d1fcbc) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #568   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          471       471           
  Lines        14838     14863   +25     
=========================================
+ Hits         14838     14863   +25     

Impacted Files	Coverage Δ
.../BootstrapBlazor/Components/Dialog/Dialog.razor.cs	100.00% <ø> (ø)
...otstrapBlazor/Components/SweetAlert/SwalService.cs	100.00% <ø> (ø)
src/BootstrapBlazor/Components/Dialog/Dialog.razor	100.00% <100.00%> (ø)
...ootstrapBlazor/Components/SweetAlert/SwalOption.cs	100.00% <100.00%> (ø)
...apBlazor/Components/SweetAlert/SweetAlert.razor.cs	100.00% <100.00%> (ø)
...azor/Components/SweetAlert/SweetAlertBody.razor.cs	100.00% <100.00%> (ø)
src/BootstrapBlazor/Extensions/SwalExtensions.cs	100.00% <100.00%> (ø)

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