fix: move BBR duration fields to workspace dep and fix serde

[gaius-qi]

Description

This pull request primarily updates dependency versions and improves configuration handling for time durations. The most notable changes are version bumps across the workspace, improved serialization of duration fields using humantime-serde, and minor code fixes for error messages and middleware cloning.

Dependency version updates:

• Bumped the workspace version and all internal dependencies from 1.2.16 to 1.2.17 in Cargo.toml, ensuring consistency across the project. [1] [2]
• Updated humantime-serde to be a workspace dependency in dragonfly-client-config/Cargo.toml and dragonfly-client-util/Cargo.toml, removing direct version specification. [1] [2]
• Added humantime-serde = "1.1.1" to the workspace dependencies in Cargo.toml.

Configuration improvements:

• Enhanced serialization of duration fields in BBRConfig by using humantime-serde, making configuration files more human-readable and easier to maintain. [1] [2]

Code fixes:

• Changed the error message in gRPC server overload responses to use lowercase for consistency in dfdaemon_download.rs and dfdaemon_upload.rs. [1] [2]
• Improved middleware cloning logic in dragonfly-client/src/grpc/middleware.rs by using std::mem::replace, ensuring correct ownership and avoiding potential issues.

Related Issue

Motivation and Context

Screenshots (if appropriate)

[chlins]

lgtm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.86%. Comparing base (01d0d11) to head (d1c345a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client/src/grpc/middleware.rs	0.00%	2 Missing ⚠️
dragonfly-client/src/grpc/dfdaemon_download.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1735      +/-   ##
==========================================
- Coverage   46.86%   46.86%   -0.01%     
==========================================
  Files          87       87              
  Lines       24815    24816       +1     
==========================================
  Hits        11629    11629              
- Misses      13186    13187       +1     

Files with missing lines	Coverage Δ
dragonfly-client-util/src/ratelimiter/bbr.rs	79.62% <ø> (-0.19%)	⬇️
dragonfly-client/src/grpc/dfdaemon_download.rs	5.03% <0.00%> (ø)
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00% <0.00%> (ø)
dragonfly-client/src/grpc/middleware.rs	25.80% <0.00%> (ø)

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