Added copy message link and copy message option in the message toolbox

[Yashraj7890]

Added copy message link and copy message option in the message toolbox used RcInstance for generating message link.

Fixes #404

Video/Screenshots

https://github.com/RocketChat/EmbeddedChat/assets/98230836/193a9d03-ce82-4fa1-9141-6660b64f33c0

[Spiral-Memory]

Great work @Yashraj7890 🚀. Just left a minor comment on the code.

[Yashraj7890]

Hey @sidmohanty, the newly pushed copy icon the upstream has been used here and the code has been adjusted to the recent pushes.