Add stress test for user-events logs exporter

[lalitb]

Changes

Adding test for user-events exporter, with steps to take results by enabling and disabling user-events. Also, added the initial results I got in my devenv. This mayn't be accurate. The next steps are to evaluate the results, and see potential improvements required.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 54.1%. Comparing base (c27ebcc) to head (82961bd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
stress/src/user_events.rs	0.0%	32 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #142     +/-   ##
=======================================
- Coverage   54.4%   54.1%   -0.3%     
=======================================
  Files         41      42      +1     
  Lines       6243    6275     +32     
=======================================
  Hits        3400    3400             
- Misses      2843    2875     +32     

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