completion: Add an api to complete columns

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The new function, flatpak_compete_columns, takes an array
of Column structs and completes a --columns= option.

Unfortunately, bash completion does not let us do better
than repeating the entire list of columns for every
possible completion. This is not ideal, but at least
it gives good results for the first column.

Closes: #2445
Approved by: alexlarsson

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