[FEATURE] Add the custom step to update user's slack status to this repository

[CdrMarks]

Description

In the Slack Frontiers session Better together: Workflow Builder and Slack apps on Thursday, Angela Kirchhof shared about a custom step used internally at Slack to set her Slack status at a scheduled date/time. A screenshot of her Workflow is below.

Would you consider adding this step to this repository?

Requirements (place an x in each of the [ ])

• [ ] ~I've read and understood the Contributing guidelines and have done my best effort to follow them.~
• [x] I've read and agree to the Code of Conduct.
• [x] I've searched for any related issues and avoided creating a duplicate issue.

[mcsescott]

Following up on this older enhancement request. I am trying to build my own status updater... is there an available "emoji picker" element? I've looked at Block Kit Builder and don't see one jumping out at me...