Ability to pin messages in chat

[mcwumbly (Dave McClure)]

Just stashing this anecdote here for additional context:

@tyler-mairose-sp

We often have a message or something important for a short period of time to convey. We would love for the ability to pin chat messages that would show up a the top of the chat window.

I am thinking for our bigger group chats we may only want admins to be able to pin chats, so maybe an additional toggle in the chat settings to only allow admins to pin messages.