Fix issue where user-supplied enrichments were lost during the startup phase

[wenxi-zeng]

• made the enrichment closure a property of event so it is not lost during startup queue replay

[codecov]

Codecov Report

Attention: Patch coverage is 74.28571% with 18 lines in your changes missing coverage. Please review.

Project coverage is 79.82%. Comparing base (b958b36) to head (db6e669).
Report is 6 commits behind head on main.

❗ Current head db6e669 differs from pull request most recent head f38a847

Please upload reports for the commit f38a847 to get more accurate results.

Files with missing lines	Patch %	Lines
...om/segment/analytics/kotlin/core/AnalyticsTests.kt	71.66%	0 Missing and 17 partials ⚠️
...com/segment/analytics/kotlin/core/utils/Plugins.kt	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #260      +/-   ##
============================================
+ Coverage     78.13%   79.82%   +1.69%     
+ Complexity      592      575      -17     
============================================
  Files            80       77       -3     
  Lines          7275     6918     -357     
  Branches        922     1069     +147     
============================================
- Hits           5684     5522     -162     
+ Misses          861      492     -369     
- Partials        730      904     +174     

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