1. Rename FilePeerTask to FileTask.
2. Rename StreamPeerTask to StreamTask.
3. Extract pulling piece task logic to pieceTaskPoller.
Signed-off-by: Jim Ma <majinjing3@gmail.com>
* feat: merge same tasks in daemon
* test: add tiny file test in daemon
* fix: when validate digest disabled, did not store metadata
Signed-off-by: Jim Ma <majinjing3@gmail.com>