feat: custom apm

[buenaflor]

📜 Description

Adds feature to create spans and configure tracesSampler

💡 Motivation and Context

Closes #83

💚 How did you test it?

Example app
Tests

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.

🔮 Next steps

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 2b27001

[buenaflor]

validating it works from demo app

[codecov]

Codecov Report

Attention: 60 lines in your changes are missing coverage. Please review.

Comparison is base (fb911de) 77.83% compared to head (2b27001) 74.95%.
Report is 15 commits behind head on main.

Files	Patch %	Lines
...ltiplatform/converters/SpanStatusConverters.jvm.kt	11.76%	28 Missing and 2 partials ⚠️
...io/sentry/kotlin/multiplatform/SentryBridge.jvm.kt	62.06%	10 Missing and 1 partial ⚠️
.../converters/TransactionNameSourceConverters.jvm.kt	14.28%	5 Missing and 1 partial ⚠️
.../converters/CustomSamplingContextConverters.jvm.kt	0.00%	5 Missing ⚠️
...in/multiplatform/TransactionContextProvider.jvm.kt	75.00%	2 Missing and 1 partial ⚠️
.../io/sentry/kotlin/multiplatform/SpanAdapter.jvm.kt	90.47%	0 Missing and 2 partials ⚠️
...orm/converters/TransactionContextConverters.jvm.kt	85.71%	0 Missing and 1 partial ⚠️
...platform/extensions/SentryOptionsExtensions.jvm.kt	85.71%	0 Missing and 1 partial ⚠️
...kotlin/io/sentry/kotlin/multiplatform/SentryKMP.kt	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
- Coverage   77.83%   74.95%   -2.88%     
==========================================
  Files          27       38      +11     
  Lines         424      615     +191     
  Branches       55       75      +20     
==========================================
+ Hits          330      461     +131     
- Misses         68      119      +51     
- Partials       26       35       +9     

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[buenaflor]

After discussion we will reconsider the approach of using the native layer directly and keep performance related product withing the cross-platform layer.