Plz Add feature Drag and Drop between computer and mobile

- [x] I have checked that a similar [feature request](https://github.com/Genymobile/scrcpy/issues?q=is%3Aopen+is%3Aissue+label%3A%22feature+request%22) does not already exist.

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The issue contains only a feature title and the default request template, with no files, tests, entry points, behavior details, or acceptance criteria. First clarify the supported drag-and-drop directions, data types, and expected Android and computer behavior; then locate the relevant subsystems and define how the feature would be tested.

Written by the indexing model from the issue text.