feat(io): narrow type of user on io session

[leedavidcs]

✅ Checklist

• [x] I have followed every step in the contributing guide (updated 2023-01-05).
• [ ] The PR title follows the conventional-commit convention.
• [ ] I have added or updated the tests related to the changes made.

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Changelog

Narrow the type of user on WebsocketSession in @pluv/io.

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **pluv** | ⬜️ Ignored ([Inspect](https://vercel.com/pluv/pluv/DrKGfmJixYtzBUBjjmkL4QutVXvL)) | [Visit Preview](https://pluv-git-feat-narrow-session-type-pluv.vercel.app) | | May 13, 2024 7:35am |

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🦋 Changeset detected

Latest commit: 3dd14dc7a46b882b633ef9c8d37e6b48bda13c78

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

This PR includes changesets to release 15 packages

| Name | Type | | ------------------------- | ----- | | @pluv/io | Minor | | @pluv/persistance-redis | Minor | | @pluv/platform-cloudflare | Minor | | @pluv/platform-node | Minor | | @pluv/pubsub-redis | Minor | | @pluv/addon-indexeddb | Minor | | @pluv/client | Minor | | @pluv/crdt | Minor | | @pluv/crdt-loro | Minor | | @pluv/crdt-yjs | Minor | | @pluv/react | Minor | | @pluv/tsconfig | Minor | | @pluv/types | Minor | | pluv | Minor | | eslint-config-pluv | Minor |

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