fix: migrate rawBytes to byte array from payloadStringValue.

[juliansteenbakker]

This PR possibly fixed #1444, #1357 and #1317 by getting the bytes from the string value instead of payloadData.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 38.31%. Comparing base (250bea4) to head (e4cb17d).

Files with missing lines	Patch %	Lines
lib/src/objects/barcode.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1529      +/-   ##
===========================================
- Coverage    38.35%   38.31%   -0.04%     
===========================================
  Files           42       42              
  Lines          996      997       +1     
===========================================
  Hits           382      382              
- Misses         614      615       +1     

Flag	Coverage Δ
unittests	38.31% <0.00%> (-0.04%)	⬇️

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