Keep backwards compatibility for attributes updates on creation

[lukasIO]

follow up for #1344 to keep backwards compatibility

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Latest commit: d0939b5

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[github-actions]

size-limit report 📦

Path	Size
dist/livekit-client.esm.mjs	86.48 KB (+0.03% 🔺)
dist/livekit-client.umd.js	92.63 KB (+0.03% 🔺)

[davidzhao]

do you think we need this level of compat? the previous behavior seems incorrect. (we don't trigger similar events for metadata upon connect)