Feat : add copy button on code snippet

[sossost]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  feature
• Why was this change needed? (You can also link to an open issue here)
  [Feature] Copy button on code snippet #950
• Other information:

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Name	Status	Preview	Comments	Updated (UTC)
docs-gpt	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 18, 2024 11:55am

[dartpain]

Hi @sossost
Thank you so much for your PR.
There are a few edits that we need to make before we can merge

1. The new copy button should only be displayed on code blocks. Not other text blocks too.
2. The copy button should become visible on hover over the code block itself, not the whole message.

Appreciate your contribution!

[sossost]

@dartpain Oh my mistake. I'm fool Additional work has been done and committed.

[dartpain]

@sossost No worries at all!
Thank you so much!

[sossost]

@dartpain Thank you too. have a nice day