feat: add DfdaemonUpload.sync_host.

[baowj-678]

Description

• Implement DfdaemonUpload.sync_host to respond for SyncHost requests.

Related Issue

dragonflyoss/dragonfly#3713

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)
  Checklist
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 77 lines in your changes missing coverage. Please review.

Project coverage is 43.63%. Comparing base (83bbf19) to head (9dd0ab4).

Files with missing lines	Patch %	Lines
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00%	77 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
- Coverage   43.93%   43.63%   -0.30%     
==========================================
  Files          58       58              
  Lines       11103    11179      +76     
==========================================
  Hits         4878     4878              
- Misses       6225     6301      +76     

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

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[gaius-qi]

Add parent selector to resource.

[gaius-qi]

Remove tokio::spawn.

[gaius-qi]

There are many problems. Continue to optimize the code.

[gaius-qi]

LGTM