feat(top-app-bar): TopAppBarFixedAdjust variants added

[mgr34]

This references #518 and can be closed with the previous merging of PR #520.

I am still unsure about screenshot testing. running yarn capture did update the correct part's of golden.json and everything appears as expected from yarn start.

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I signed it

[codecov-io]

Codecov Report

Merging #524 into rc0.8.0 will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           rc0.8.0     #524      +/-   ##
===========================================
+ Coverage    96.62%   96.63%   +0.01%     
===========================================
  Files           59       59              
  Lines         1984     1991       +7     
  Branches       235      239       +4     
===========================================
+ Hits          1917     1924       +7     
  Misses          67       67

Impacted Files	Coverage Δ
packages/top-app-bar/index.js	100% <ø> (ø)	⬆️
packages/top-app-bar/FixedAdjust.js	100% <100%> (ø)	⬆️

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[moog16]

Thanks for opening PR! Just a few changes.

[moog16]

tests: #538

[moog16]

Test passing and CLA signed in: #524 (comment) merging!