curl: add --url-query

curl: add --url-query

This option adds a piece of data, usually a name + value pair, to the
end of the URL query part. The syntax is identical to that used for
--data-urlencode with one extension:

If the argument starts with a '+' (plus), the rest of the string is
provided as-is unencoded.

This allows users to "build" query parts with options and URL encoding
even when not doing GET requests, which the already provided option -G
(--get) is limited to.

This idea was born in a Twitter thread.

Closes #9691