Add support for replying to messages in `Message` box

[kuv2707]

Description

We need to add a way to select a message to be replied. The design is subject to discussion. The implementation is mostly there:

• The ChatMessage type has a field ref which stores the id of the message the current message is referring to.

Possible design

Perhaps we can make it so that clicking on a message selects it for replying, and when sending the message, we include the selected message's id in the ref field. When displaying a message, we can take the content of the message ref is pointing to, and truncate it to around 20 characters, and display it in a dark css filter before the actual message content.

[issue-assigner[bot]]

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[kuv2707]

@shivansh-bhatnagar18 Please take care of the design and UX that should be there for this.

[ritwik-69]

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