[web] Added displaying 'Labels' to InlineEngagment

Summary: Added the possibility to label the messages to display 'Edited' in the next diffs.

Test Plan:

• Run the app.
• Added the label to every message.
• Checked if the labels are displayed correctly both with text messages and with images.
• Checked if Reactions/Threads are also correctly positioned next to the label.
• Checked if labels in a few messages in a row do not take too much space.
• Checked displaying on both the left and right side of the chat.

Screenshots:

Reviewers: michal, inka, ginsu

Reviewed By: ginsu

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7017