Feature request

Add slck emoji list command to list custom workspace emojis.

Use case

Need to enumerate custom emojis available in the workspace for bot reaction vocabulary. Currently no way to do this via slck — have to hit the Slack API directly with emoji.list.

Proposed interface

slck emoji list                    # text output, one per line
slck emoji list -o json            # JSON output
slck emoji list --include-aliases  # include alias mappings

Required Slack scope

emoji:read on the user token.