feat(upload): add persistent task management features for upload grpc

[gaius-qi]

Description

This pull request implements and wires up persistent task management features in the DfdaemonUploadServer and its handler, enabling full support for stat-ing, deleting, syncing, and downloading persistent tasks and their pieces via gRPC. The changes include adding the necessary persistent task manager, updating constructors and struct members, and providing complete implementations for the relevant gRPC methods.

Persistent task manager integration:

• Added persistent_task field to both DfdaemonUploadServer and DfdaemonUploadServerHandler, updated their constructors, and ensured the persistent task manager is passed and used throughout the server and handler logic. [1] [2] [3] [4] [5] [6]

Persistent task gRPC method implementations:

• Implemented stat_persistent_task and delete_persistent_task methods to allow clients to query and delete persistent tasks, including proper tracing, metrics collection, and error handling.
• Implemented sync_persistent_pieces as a streaming RPC, enabling clients to receive metadata for finished pieces of a persistent task as they become available, with robust error handling and streaming logic.
• Implemented download_persistent_piece to allow clients to download the content of a specific persistent piece, including reading from local storage, metrics, and error handling.

Related Issue

Motivation and Context

Screenshots (if appropriate)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 313 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.29%. Comparing base (47e6e01) to head (11af72e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00%	297 Missing ⚠️
dragonfly-client/src/bin/dfdaemon/main.rs	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1541      +/-   ##
==========================================
- Coverage   47.04%   46.29%   -0.76%     
==========================================
  Files          71       71              
  Lines       18947    19255     +308     
==========================================
  Hits         8914     8914              
- Misses      10033    10341     +308     

Files with missing lines	Coverage Δ
dragonfly-client/src/bin/dfdaemon/main.rs	0.00% <0.00%> (ø)
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00% <0.00%> (ø)

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[chlins]

lgtm