chore: log effect functions in log_effect_tree

[Rich-Harris]

this makes log_effect_tree more helpful — you can click in devtools to see the location of the function, which makes a huge difference when trying to understand the shape of the effect tree

[changeset-bot]

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Latest commit: b1d888a

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[github-actions]

Playground

pnpm add https://pkg.pr.new/svelte@16468

[Rich-Harris]

just gonna insta-merge this one because it has no impact outside log_effect_tree and is super useful

[paoloricciuti]

I keep forgetting this thing exists