Implement Broadcast for Document Title Change Notifications

[devleejb]

What would you like to be added:
The recent feature addition that allows changing document titles (refer to issue #143) does not currently notify peers immediately when a document's title is changed. To enhance the user experience, it is proposed to utilize Yorkie's Broadcast API to notify peers about document title changes.

Why is this needed:
Implementing this feature will ensure that all peers are immediately aware of document title changes, improving collaborative functionality and keeping all users synchronized with the most current document information. This enhancement aligns with the overall goal of providing a seamless collaborative experience within the platform.

Additional Information:

[devleejb]

Related to yorkie-team/yorkie-team.github.io#164.