feat(Notification): initial Implementation

[Lukas742]

Closes #159
Closes #160

[codecov-io]

Codecov Report

Merging #171 into master will increase coverage by 0.21%.
The diff coverage is 81.55%.

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
+ Coverage   73.96%   74.17%   +0.21%     
==========================================
  Files         156      158       +2     
  Lines        3618     3721     +103     
  Branches      639      669      +30     
==========================================
+ Hits         2676     2760      +84     
- Misses        720      734      +14     
- Partials      222      227       +5

Impacted Files	Coverage Δ
...es/main/src/components/NotificationGroup/index.tsx	100% <100%> (ø)
...ackages/main/src/components/Notification/index.tsx	80.8% <80.8%> (ø)

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[MarcusNotheis]

I will leave this PR open for the moment, we want to make sure that all bugs are gone in v0.6.0 before we add new components.

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