feat: record the size and content hash of client and prerendered files for adapters

[Nic-Polumeyv]

Kit now exposes the size and content hash of every client and prerendered file as builder.clientFiles and builder.prerenderedFiles, and returns the sizes of the variants builder.compress writes. adapter-node and adapter-bun read those instead of hashing.

These fields are computed on first access, so an adapter that doesn't need this pays nothing.

Stacked on #17109.

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from f9f67b5:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/f9f67b55024eb9be19338df3337d2ab672a55ff0

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16994

[changeset-bot]

🦋 Changeset detected

Latest commit: f9f67b5

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

This PR includes changesets to release 3 packages

Name	Type
@sveltejs/kit	Major
@sveltejs/adapter-node	Major
@sveltejs/adapter-bun	Major

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Preview: https://svelte-dev-git-preview-kit-16994-svelte.vercel.app/