add confirm modal before pinning messages

[Akshun-01]

Implement Confirmation before Pinning Message feature

Acceptance Criteria fulfillment

• Check for the state to trigger the modal
• Make the confirmation Modal
• Handle confirmation or canceling of the modal

Fixes #450

Video/Screenshots

pinMsgConfirm.mp4

[sidmohanty11]

Thanks for the PR @Akshun-01 but I'm not sure if this addition is necessary

[Akshun-01]

Yeah, Zishan and I also discussed the same.
I could only think of one use case where this might be important or necessary.
Integration in a professional platform where you can't go on pinning stuff by mistake as it is public and can't be deleted.
But yeah, a very niche use case and can be ignored in most cases.
So, we can leave the feature out!