feat(snackbar): Support custom components

[trimox]

WIP

closes #2121

[codecov]

Codecov Report

Merging #2122 into master will increase coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #2122      +/-   ##
==========================================
+ Coverage   90.65%   90.66%   +<.01%     
==========================================
  Files         100      100              
  Lines        4344     4295      -49     
  Branches      559      548      -11     
==========================================
- Hits         3938     3894      -44     
+ Misses        215      212       -3     
+ Partials      191      189       -2

Impacted Files	Coverage Δ
packages/snackbar/module.ts	100% <ø> (ø)	⬆️
packages/snackbar/snackbar.ts	95.38% <100%> (+1.94%)	⬆️
packages/snackbar/snackbar.component.ts	75% <50%> (-15.33%)	⬇️
packages/snackbar/snackbar-container.ts	90.9% <60%> (-3.21%)	⬇️

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