feat: slash dm (#846)

* chore: cleanup comments

* feat: slash in dm and better event args

Co-authored-by: Skillz4Killz <Skillz4Killz@users.noreply.github.com>

tests/channels/create_channel.ts

@@ -173,5 +173,3 @@ Deno.test({
 // TODO: Need to validate tests for these options
 // /** Sorting position of the channel */
 // position?: number;
-// /** The channel's permission overwrites */
-// permissionOverwrites?: Overwrite[];