feat: get network speed for scheduler

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

[codecov]

Codecov Report

❌ Patch coverage is 25.54745% with 102 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.53%. Comparing base (e1ae65a) to head (3820675).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client-util/src/net/mod.rs	31.81%	75 Missing ⚠️
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00%	22 Missing ⚠️
dragonfly-client/src/bin/dfdaemon/main.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1279      +/-   ##
==========================================
+ Coverage   48.47%   48.53%   +0.05%     
==========================================
  Files          60       60              
  Lines       15011    15002       -9     
==========================================
+ Hits         7277     7281       +4     
+ Misses       7734     7721      -13     

Files with missing lines	Coverage Δ
dragonfly-client/src/announcer/mod.rs	0.00% <ø> (ø)
dragonfly-client/src/bin/dfdaemon/main.rs	0.00% <0.00%> (ø)
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00% <0.00%> (ø)
dragonfly-client-util/src/net/mod.rs	31.30% <31.81%> (+31.30%)	⬆️

... and 3 files with indirect coverage changes

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[LunaWhispers]

lgtm