`detect` for strings

Various commands for detecting things.

Signature

> detect {flags}

input	output
nothing	string

You must use one of the following subcommands. Using this command as-is will only produce this help message.

name	description	type
`detect columns`	Attempt to automatically split text into multiple columns.	built-in
`detect type`	Infer Nushell datatype from a string.	built-in