Add saveUsername and make PreJoin backwards compatible

[Ocupe]

This pull request adds a new function, saveUsername, to the usePersistentUserChoices hook. This function allows the user's chosen username to be saved to persistent storage.

For backward compatibility and simplicity, the properties of the UserChoices type have been updated to match the original LocalUserChoices type. To avoid TS-hell The goal now is to deprecate the e2ee and sharedPassphrase properties before changing the type to UserChoices.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6489844

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[github-actions]

size-limit report 📦

Path	Size
LiveKitRoom only	2.06 KB (+10.53% 🔺)
LiveKitRoom with VideoConference	31.25 KB (+0.32% 🔺)
All exports	36.63 KB (+0.22% 🔺)

[lukasIO]

lgtm!