Prepare initial SvelteKit SDK Alpha release

[Lms24]

Before release

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1. Ensure we have unit tests for the SK-specific SDK features
2. Ensure README has an "Alpha state" note
3. chore(sveltekit): Update README with setup instructions #7490
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4. chore(repo): Adjust Craft config to publish SvelteKit SDK to NPM #7507
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5. Follow "New SDK Release Checklist" to ensure all necessary files are in place and the release/publish setup is configured
6. Prepare Release registry PR (feat: Add @sentry/sveltekit SDK entry sentry-release-registry#103)

After release

Beta Give feedback

1. Add @sentry/sveltekit to the release registry (merge feat: Add @sentry/sveltekit SDK entry sentry-release-registry#103)
2. Reach out to community with feedback request