handle promise in Events.raise

[pamapa]

Closes/fixes #1312

Checklist

• This PR makes changes to the public API
• I have included links for closing relevant issue numbers

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (9f55da2) 78.33% compared to head (5af4847) 78.33%.

Files	Patch %	Lines
src/SessionMonitor.ts	0.00%	4 Missing ⚠️
src/UserManagerEvents.ts	57.14%	3 Missing ⚠️
src/SilentRenewService.ts	0.00%	1 Missing ⚠️
src/navigators/IFrameWindow.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1313   +/-   ##
=======================================
  Coverage   78.33%   78.33%           
=======================================
  Files          45       45           
  Lines        1731     1731           
  Branches      344      344           
=======================================
  Hits         1356     1356           
  Misses        338      338           
  Partials       37       37           

Flag	Coverage Δ
unittests	78.33% <62.50%> (ø)

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