Add SlashCommand to show a list of commands

[quankhuc]

The "Slash Command" has become more popular, with the ease of typing a simple "/" character to show a list of command suggestion. I wonder if you can add that as an extension. Tiptap is also looking to add that as an extension as well so it would be nice if this editor can support Slash Command
Describe the solution you'd like
I want a drop down list of commands shown to me when I type "/" in the editor. I also can search for command by typing commands alias. For example, if I type "/big heading", the command to set heading to level 1 shown up. I can choose this command by either click on it or hit the "Enter" key.

[okijhhyu]

U can use titptap extension command for this purpose. I use it so, but maybe it will be rewrote.