chore: add download/hash scripts for sandbox

[Rich-Harris]

Copying playgrounds to the sandbox in this repo, for local debugging, is currently a bit of a chore, as is the reverse operation. This PR adds two new scripts. The first one downloads a playground to playgrounds/sandbox/src (it will use the hash, if present, and if not get the data from svelte.dev/playground/api):

pnpm download https://svelte.dev/playground/8a021b2ec2064230bde4a10b08464876?version=5.19.7

The second hashes the current contents of playgrounds/sandbox/src and copies a URL to the clipboard:

pnpm hash

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7df8aa3

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[github-actions]

Playground

pnpm add https://pkg.pr.new/svelte@15218