feat: Add a Preview Feature to check the text after formatting it.

[thepiyush-303]

Brief Title

I need to provide users with a preview option for formatted messages before sending them,
So that they can review and ensure the message appears as intended.
Fixes #890

Video/Screenshots

Screencast.from.2025-01-13.20-59-12.webm

PR Test Details

Hey @Spiral-Memory,

I'm not sure if this is necessary, but as a user, I wanted this feature in RC, so I started working on it without considering the requirement. If it turns out that it's not needed, please leave feedback on my changes.

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-889 after approval. Contributors are requested to replace <pr_number> with the actual PR number.

[thepiyush-303]

@Spiral-Memory
I will improve it further, if we are including it.

[devanshkansagra]

Hey @thepiyush-303, this is good feature to get implemented, LGTM ! 🎉

[thepiyush-303]

Thankyou, @devanshkansagra

[abirc8010]

Hi @thepiyush-303 , this seems like a nice addition 🚀 !
I noticed that you're adding the marked package as a dependency.
You might have observed that EC already has a markups package for handling markdowns. Could we have utilized that? 🤔
Let @Spiral-Memory confirm it once.

[thepiyush-303]

Hi @thepiyush-303 , this seems like a nice addition 🚀 ! I noticed that you're adding the marked package as a dependency. You might have observed that EC already has a markups package for handling markdowns. Could we have utilized that? 🤔 Let @Spiral-Memory confirm it once.

the markup you are talking about needs message body (md) to format the text, however we do not have acces to it initially.

[devanshkansagra]

He might be talking about this thing i.e marked