Introduce vitalAppLaunchEventMapper

[aleksandr-gringauz]

What does this PR do?

Adding vitalAppLaunchEventMapper similar to vitalOperationStepEventMapper now that app launch vital events have a separate type.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[datadog-official[bot]]

🎯 Code Coverage
• Patch Coverage: 80.00%
• Total Coverage: 71.04% (-0.28%)
View detailed report

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[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 71.03%. Comparing base (2708d99) to head (58ca36d).

Additional details and impacted files

@@                               Coverage Diff                                @@
##           aleksandr-gringauz/feature/app-launch-vitals    #2987      +/-   ##
================================================================================
+ Coverage                                         70.99%   71.03%   +0.05%     
================================================================================
  Files                                               831      831              
  Lines                                             30659    30666       +7     
  Branches                                           5216     5217       +1     
================================================================================
+ Hits                                              21764    21783      +19     
- Misses                                             7399     7400       +1     
+ Partials                                           1496     1483      -13     

Files with missing lines	Coverage Δ
...kotlin/com/datadog/android/rum/RumConfiguration.kt	96.39% <100.00%> (+0.09%)	:arrow_up:
...lin/com/datadog/android/rum/internal/RumFeature.kt	89.78% <100.00%> (+0.32%)	:arrow_up:
...ndroid/rum/internal/domain/event/RumEventMapper.kt	100.00% <100.00%> (ø)

... and 27 files with indirect coverage changes

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