fix: update metaplex decoding

[justinenerio]

Changes

• updates metadata decoding to use borsh

Related issues

Resolves PR #385
Fixes #881

Checklist

• PR is ready for review (if not, it should be a draft).
• PR title follows Conventional Commits guidelines.
• Screenshots/video added.
• Tests added.
• Self-review done.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c74df4b) 81.13% compared to head (4d489c1) 81.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #919      +/-   ##
==========================================
+ Coverage   81.13%   81.19%   +0.06%     
==========================================
  Files         183      188       +5     
  Lines        3939     3936       -3     
==========================================
  Hits         3196     3196              
+ Misses        743      740       -3     

Flag	Coverage Δ
solana-beta	81.19% <100.00%> (?)
solana-stable	81.19% <100.00%> (+0.06%)	⬆️

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