Convenience method setAttribute to update a single key/value pair

[davidzhao]

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Latest commit: c946c07

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[github-actions]

size-limit report 📦

Path	Size
dist/livekit-client.esm.mjs	80.28 KB (+0.04% 🔺)
dist/livekit-client.umd.js	86.11 KB (+0.04% 🔺)

[lukasIO]

Some thoughts:

• with Make metadata updates async and throw after timeout #1168 still pending, we'll be in a situation where setting multiple attributes after one another will take a lot longer (as it waits for server ack)
• I'd be inclined to offer one primary way to update attributes, the current api with setAttributes({myAttr}); seems to be as concise (if not more) than explicitly requiring users to set the key separately as a string with setAttribute('myAttr', myAttr) 🤔