Update display type serialization

[sisyphusSmiling]

Continues: #128

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For contributor use:

• Targeted PR against main branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.70%. Comparing base (02aab3f) to head (4a11fd2).
Report is 150 commits behind head on main.

Files with missing lines	Patch %	Lines
cadence/contracts/utils/SerializeMetadata.cdc	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   86.19%   86.70%   +0.50%     
==========================================
  Files          18       18              
  Lines         884      970      +86     
==========================================
+ Hits          762      841      +79     
- Misses        122      129       +7     

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