feat: allow comments in json transforms

[manuel3108]

Closes #1367

Description

We previously used silver-fleece for this. The stringify api we were using drops comments. There is also a patch function in that same package, but it has major problems with dropping new lines and if entries are re-ordered.

Therefore we will be switching to comment-json which works as expected out of the box.

Checklist

• Update snapshots (if applicable)
• Add a changeset (if applicable)
• Allow maintainers to edit this PR
• I care about what I'm doing, no matter the tool I use (Notepad, Sublime, VSCode, AI...)

[pkg-svelte-dev]

Install the latest version of sv from e9a258d:

pnx https://pkg.svelte.dev/sv/c/e9a258d67b94fb01c8fabbc1d2259e265b25e5fa create

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/cli/pr/1381

[changeset-bot]

🦋 Changeset detected

Latest commit: e9a258d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@sveltejs/sv-utils	Minor
sv	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-cli-1381-svelte.vercel.app/

[manuel3108]

CI is failing here because of #1377, so that's expected.