group for filters> group {flags} (group_size)
group_size: the size of each group| input | output | 
|---|---|
| list<any> | list<list<any>> | 
Group the a list by pairs
> [1234] |group2
╭───┬───────────╮
│0│╭───┬───╮│
│││0│1││
│││1│2││
││╰───┴───╯│
│1│╭───┬───╮│
│││0│3││
│││1│4││
││╰───┴───╯│
╰───┴───────────╯
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    https://www.nushell.sh/commands/docs/group.html