feat: support record screen view event manually

[zhu-xiaowei]

• PR title and description conform to Pull Request guidelines.

Description of changes:

1. support record screen view event manually

How did you test these changes?
(Please add a line here how the changes were tested)
added new unit test case for verify the manually screen view events record

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

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (5197b2a) 87.12% compared to head (39a17e1) 87.20%.

Files	Patch %	Lines
...aws/solution/clickstream/ClickstreamAnalytics.java	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #63      +/-   ##
============================================
+ Coverage     87.12%   87.20%   +0.08%     
- Complexity      446      454       +8     
============================================
  Files            42       42              
  Lines          1639     1665      +26     
  Branches        149      152       +3     
============================================
+ Hits           1428     1452      +24     
- Misses          133      135       +2     
  Partials         78       78              

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