Possibility to exchange metadata from source to destination

[a-mesin]

We need a way to provide the destination resource metadata/contextual data from the source resource.

Example use case

filesystem -> filesystem backup where the target file should be named just like the source file suffixed with a user specified string f.e. timestamp.

Rough idea for the implementation

Instead of running the io.Copy directly in the backup command we introduce a new struct (f.e. called BackupProcessor) which takes in the reader and writer for the io.Copy function and in addition to that arbitrary metadata (maybe a map[string]any or we even can decide on a fixed set of possible metadata for each destination type?) and populates the writer with that metadata before running the io.Copy

[github-actions]

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