[DRAFT] Add stubs/no-op support for unsupported targets

[buenaflor]

📜 Description

Users have bad devex if they use targets that we don't support.
Currently the SDK won't compile and the user would have to shift their sourceSet architecture which is unrealistic.

💡 Motivation and Context

Adds no-op support for js and wasmJs so users can freely use Sentry in the official supported targets and no-op targets.

Closes #328
Closes #327

💚 How did you test it?

📝 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]

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

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

- [DRAFT] Add stubs/no-op support for `js` and `wasmJs` target ([#426](https://github.com/getsentry/sentry-kotlin-multiplatform/pull/426))

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

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