refactor: allow custom handlers for processing push/pull status updates #2342
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Contributing to the refactoring issue #1680
Currently, the way image push/pull commands are refactored, it is difficult to obtain download/upload status updates programmatically. Nerdctl has its own printing logic, but users may want to handle status updates directly via code when importing those subcommands. These changes allow users to define custom handlers for processing status updates during push/pull.