feat(core): Session based Traces for Mobile

[adinauer]

PR Stack (Session based Traces for Mobile)

• feat(core): Session based Traces for Mobile #5383
• fix(core): [Session based Traces for Mobile 1] Keep spanless baggage mutable #5384

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Collection PR for the Session based Traces for Mobile stack. Squash-merge this once all stack PRs are merged.

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

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

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

- Session based Traces for Mobile ([#5383](https://github.com/getsentry/sentry-java/pull/5383))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

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[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.41.0 (1)	release

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