feat(modal): add modal service events, fix modal content onDestroy [fixes #2256]

[IlyaSurmay]

closes #2268

[codecov]

Codecov Report

Merging #2272 into development will decrease coverage by 0.06%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##           development   #2272      +/-   ##
==============================================
- Coverage        87.46%   87.4%   -0.07%     
==============================================
  Files               95      95              
  Lines             2681    2683       +2     
  Branches           358     359       +1     
==============================================
  Hits              2345    2345              
- Misses             214     215       +1     
- Partials           122     123       +1

Impacted Files	Coverage Δ
src/component-loader/component-loader.class.ts	77.04% <0%> (-1.29%)	⬇️

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