Plugin support for custom FileStorages

[vw-anton]

We would like to use a custom (HTTP) file storage implementation as the existing ones do not fulfil our needs (custom auth in OkHttp client required via request interceptor). In our opinion a valid approach could be to plugin a custom implementation which is then configured via the config.yml file.

@MarcelBochtler / @mnonnenmacher mentioned in todays community call that there might be a bigger refactoring around storages (required) which should also be taken into account.

[sschuberth]

@vw-anton would you agree that this duplicates #6603?

[vw-anton]

Absolutely, did not spot this during my initial search.

[sschuberth]

Absolutely, did not spot this during my initial search.

Great, then please upvote that issue to reflect your interest!