Rename SerializeNFT to SerializeMetadata

[sisyphusSmiling]

Closes: #30

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For contributor use:

• Targeted PR against master 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

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@3a8d955). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage        ?   82.82%           
=======================================
  Files           ?       18           
  Lines           ?      827           
  Branches        ?        0           
=======================================
  Hits            ?      685           
  Misses          ?      142           
  Partials        ?        0           

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