feat: add configuration for user engagement event

[zhu-xiaowei]

• PR title and description conform to Pull Request guidelines.

Description of changes:

1. add configuration for user engagement event

How did you test these changes?
Added test case for close _user_engagement event and assert will not record this event.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.40% 🎉

Comparison is base (18ee39b) 86.17% compared to head (936de6a) 86.57%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #34      +/-   ##
============================================
+ Coverage     86.17%   86.57%   +0.40%     
- Complexity      388      392       +4     
============================================
  Files            39       39              
  Lines          1410     1415       +5     
  Branches        126      125       -1     
============================================
+ Hits           1215     1225      +10     
+ Misses          120      116       -4     
+ Partials         75       74       -1     

Files Changed	Coverage Δ
...aws/solution/clickstream/AWSClickstreamPlugin.java	83.52% <ø> (+2.63%)	⬆️
...clickstream/AWSClickstreamPluginConfiguration.java	100.00% <100.00%> (+4.87%)	⬆️
...olution/clickstream/ClickstreamManagerFactory.java	100.00% <100.00%> (ø)
...tion/clickstream/client/AutoRecordEventClient.java	100.00% <100.00%> (ø)
...n/clickstream/client/ClickstreamConfiguration.java	100.00% <100.00%> (ø)

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