Avoid recreating purchases same config

[tonidero]

Description

This came from a conversation in Slack. I think we can limit the amount of multiple configuration issues if we don't reconfigure the SDK with the same parameters that were originally passed. I don't think there should be any use cases for that in any case? Keeping on hold to get feedback

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 82.35%. Comparing base (26074e4) to head (e8cd5f1).

Files with missing lines	Patch %	Lines
...com/revenuecat/purchases/PurchasesConfiguration.kt	71.42%	0 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1866      +/-   ##
==========================================
- Coverage   82.37%   82.35%   -0.03%     
==========================================
  Files         225      225              
  Lines        7900     7929      +29     
  Branches     1104     1119      +15     
==========================================
+ Hits         6508     6530      +22     
+ Misses        953      952       -1     
- Partials      439      447       +8     

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