Reference upload glob pieces in output filename

Hi,

It struck me that when using globbing for uploads to a single URL, there is no 
way to store the three responses in separate output files. Example:

   curl -T '{one,two,three}' https://upload.example/ -o save-output

This command line makes curl overwrite the same target file multiple times and 
afterwards only the last response remains. *sad face*

As a comparison, downloading with globbing in the URL allows us to use pieces 
of the glob in the output name:

   curl 'https://upload.example/{one,two,three}' -o 'save-#1'

I have now made a first PR and attempt to allow us to fix the initial omission 
by adding a way to refer to upload globs separately for the output filename, 
using ! instead of #. Like this:

   curl -T 'file{1,2,3}' https://upload.example/ -o 'response-!1'

Maybe we can think of a better way?

   https://github.com/curl/curl/pull/21407

-- 

  / daniel.haxx.se || https://rock-solid.curl.dev
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