Update DynamicPropertyBuffer implementation

[Kyle-Ye]

FIx misc issues and update to use UnsafeHeterogeneousBuffer

[codecov]

Codecov Report

❌ Patch coverage is 54.71698% with 72 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.31%. Comparing base (4416a41) to head (c99142d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/Data/DynamicProperty/DynamicPropertyBuffer.swift	53.02%	70 Missing ⚠️
...ta/DynamicProperty/UnsafeHeterogeneousBuffer.swift	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #535      +/-   ##
==========================================
+ Coverage   24.00%   24.31%   +0.31%     
==========================================
  Files         507      507              
  Lines       28996    28903      -93     
==========================================
+ Hits         6960     7029      +69     
+ Misses      22036    21874     -162     

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