chore(svelte): Add entry for Svelte SDK in craft.yml

[Lms24]

⚠️ opening as a draft for now b/c not sure if this should be merged before/after we added the SDK to the release registry (see https://github.com/getsentry/sentry-release-registry/pull/80)

This PR adds an entry to craft.yml in the release registry section.

ref: #5520

[AbhiPrasad]

This can be merged in after we merge in the release registry PR (and right before we are ready to make a release).

[AbhiPrasad]

Yeah so make the order clear here:

• We merge in release registry
• We merge this in
• We cut a release

That should make sure it all works and nothing breaks - but let's see...

[Lms24]

I'll make sure to document this in a sort of "New SDK release checklist"