RUM-4508 Add OpenTelemetry use case into the vendor-lib sample

[mariusc83]

What does this PR do?

A brief description of the change being made with this pull request.

Motivation

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Additional Notes

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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)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.23%. Comparing base (5e72fef) to head (5951ec7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/otel-support #2069 +/- ## ======================================================== - Coverage 67.39% 67.23% -0.16% ======================================================== Files 733 733 Lines 27022 27015 -7 Branches 4573 4574 +1 ======================================================== - Hits 18209 18162 -47 - Misses 7585 7638 +53 + Partials 1228 1215 -13 ``` [see 37 files with indirect coverage changes](https://app.codecov.io/gh/DataDog/dd-sdk-android/pull/2069/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog)