stream-chat 3.0.0 on Node.js Yarn

Removed seamless-immutable library completely for client/channel state management in favor of pure JS objects #602. This will likely require some changes to frontend usage of these states with spread operators for deeply nested data updates
Changed channel state messageToImmutable function to formatMessage #602
channel.sendReaction(messageID: string, reaction: Reaction, user_id?: string, enforce_unique?: boolean) is changed to channel.sendReaction(messageID: string, reaction: Reaction, options?: { enforce_unique?: boolean }). The removed user_id parameter should be added to reaction.
client.setUser() function is removed in favor of client.connectUser() #612
client.setAnonymousUser() function is removed in favor of client.connectAnonymousUser() #612
client.updateUser() function is removed in favor of client.upsertUser() #612
client.updateUsers() function is removed in favor of client.upsertUsers() #612
client._userAgent() function is removed in favor of client.getUserAgent() #612