Enhancement standalone type uint8

[lukasdreyer]

Describe your changes here:

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General

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Tests

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[codecov]

Codecov Report

❌ Patch coverage is 96.61017% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.15%. Comparing base (1aff0a3) to head (c5e2676).

Files with missing lines	Patch %	Lines
...mes/t8_standalone/t8_standalone_implementation.hxx	96.61%	2 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           standalone-scheme-types    #1900   +/-   ##
========================================================
  Coverage                    76.15%   76.15%           
========================================================
  Files                          103      103           
  Lines                        19423    19424    +1     
========================================================
+ Hits                         14791    14792    +1     
  Misses                        4632     4632           

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