Feat: Binding focused state to elements

[RaiVaibhav]

Svelte 5 rewrite

Feat: #8949

• Introduced new binding name focused.
• Added warning which says no to use, for screen reader.
• To avoid edge case, added error to not reference multiple bind:focused with same state/props/variable

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• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
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• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests and linting

• Run the tests with pnpm test and lint the project with pnpm lint

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Latest commit: 6e65258

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