[feature] cache only, without processing

[MichalLebeda]

It may be useful to just cache files and process them later.
I think that something like -f none would do the job.

[Leo4815162342]

@MichalLebeda

can you specify exactly what you are referring to?

dukascopy-node already enables caching via --cache flag: https://www.dukascopy-node.app/using-cache

[MichalLebeda]

@Leo4815162342 I would like to avoid outputting to CSV. Would like to just download, cache files and process them later.