Add support for participant attributes

[lukasIO]

after this gets merged, I'll update #1168 to include request error handling also for the attribute updates.

Do we want a protocol bump for this so that clients can know whether or not the server supports attributes already?

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🦋 Changeset detected

Latest commit: 9f64807233ce369bbd0e6dbed5917c203f721d33

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

This PR includes changesets to release 1 package

| Name | Type | | -------------- | ----- | | livekit-client | Minor |

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[github-actions[bot]]

size-limit report 📦

Path	Size
dist/livekit-client.esm.mjs	80.19 KB (+0.28% 🔺)
dist/livekit-client.umd.js	85.99 KB (+0.29% 🔺)