Remove allocations for better performance from Python, cleanup

[kshyatt-aws]

Issue #, if available: N/A

Description of changes: Makes writing to JSON substantially faster for big statevectors/density matrices. Cleaned up a lot of internal allocations in the gate kernels. Benchmarked from Python and seeing speedups now comparable to what we see from Julia.

Testing done: Unit tests passed locally.

Merge Checklist

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[codecov]

Codecov Report

Attention: Patch coverage is 99.53052% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.03%. Comparing base (598c8b6) to head (6ac6f08).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...aketSimulatorPythonExt/BraketSimulatorPythonExt.jl	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   98.88%   99.03%   +0.15%     
==========================================
  Files          23       23              
  Lines        3216     3304      +88     
==========================================
+ Hits         3180     3272      +92     
+ Misses         36       32       -4     

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