fix: Create a copy of config passed in initialize, so that theme variables are not leaked to the object

[sidharthv96]

📑 Summary

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Resolves #

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 5.22%. Comparing base (04c29e2) to head (78fbf36).
Report is 18 commits behind head on develop.

Files	Patch %	Lines
packages/mermaid/src/mermaidAPI.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5725      +/-   ##
==========================================
- Coverage     5.22%   5.22%   -0.01%     
==========================================
  Files          323     323              
  Lines        46212   46214       +2     
  Branches       537     537              
==========================================
  Hits          2415    2415              
- Misses       43797   43799       +2     

Flag	Coverage Δ
unit	5.22% <0.00%> (-0.01%)	⬇️

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Files	Coverage Δ
packages/mermaid/src/mermaidAPI.ts	0.00% <0.00%> (ø)

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	44 changed	Aug 20, 2024, 11:44 AM