feat: support persist cache task when scheduler replicates task

[gaius-qi]

Description

This pull request includes various changes to the dragonfly-client project, focusing on version updates, error handling improvements, and disk space management enhancements. The key changes are listed below.

Version Updates:

• Updated the version of dragonfly-client and its dependencies from 0.2.5 to 0.2.6 in Cargo.toml. [1] [2]

Error Handling Improvements:

• Added a new error variant NoSpace to the DFError enum in dragonfly-client-core/src/error/mod.rs to handle cases where there is no space left on the device.

Disk Space Management Enhancements:

• Introduced methods in dragonfly-client-storage/src/content.rs and dragonfly-client-storage/src/lib.rs to check available and total disk space, and to verify if there is enough space to store content. [1] [2]
• Modified the GC implementation in dragonfly-client/src/gc/mod.rs to use the new disk space methods for evicting tasks based on disk usage. [1] [2]

Configuration Adjustments:

• Changed the default scheduler schedule timeout from 10 seconds to 180 seconds in dragonfly-client-config/src/dfdaemon.rs.

Code Cleanup:

• Removed unused imports and redundant code from various files, including dragonfly-client/src/gc/mod.rs and dragonfly-client/src/grpc/dfdaemon_download.rs. [1] [2]

These changes collectively enhance the project's robustness and efficiency, particularly in handling disk space and improving error management.

Related Issue

dragonflyoss/dragonfly#3811

Motivation and Context

Screenshots (if appropriate)

[codecov]

Codecov Report

Attention: Patch coverage is 0.78125% with 127 lines in your changes missing coverage. Please review.

Project coverage is 33.19%. Comparing base (e787afe) to head (98e6af0).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00%	39 Missing ⚠️
dragonfly-client/src/grpc/dfdaemon_download.rs	0.00%	21 Missing ⚠️
dragonfly-client-storage/src/content.rs	0.00%	18 Missing ⚠️
dragonfly-client-storage/src/lib.rs	0.00%	10 Missing ⚠️
dragonfly-client/src/metrics/mod.rs	0.00%	10 Missing ⚠️
dragonfly-client/src/bin/dfcache/import.rs	0.00%	9 Missing ⚠️
...onfly-client/src/resource/persistent_cache_task.rs	0.00%	7 Missing ⚠️
dragonfly-client/src/resource/piece_collector.rs	0.00%	7 Missing ⚠️
dragonfly-client/src/resource/task.rs	0.00%	4 Missing ⚠️
dragonfly-client-storage/src/metadata.rs	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #953      +/-   ##
==========================================
+ Coverage   32.72%   33.19%   +0.46%     
==========================================
  Files          60       59       -1     
  Lines        9776     9638     -138     
==========================================
  Hits         3199     3199              
+ Misses       6577     6439     -138     

Files with missing lines	Coverage Δ
dragonfly-client-config/src/dfdaemon.rs	49.07% <100.00%> (ø)
dragonfly-client-core/src/error/mod.rs	59.09% <ø> (ø)
...onfly-client-storage/src/storage_engine/rocksdb.rs	65.85% <ø> (+15.85%)	⬆️
dragonfly-client/src/bin/dfcache/main.rs	0.00% <ø> (ø)
dragonfly-client/src/gc/mod.rs	0.00% <ø> (ø)
dragonfly-client-storage/src/metadata.rs	57.83% <0.00%> (-0.24%)	⬇️
dragonfly-client/src/proxy/cache.rs	55.47% <0.00%> (ø)
dragonfly-client/src/resource/task.rs	0.00% <0.00%> (ø)
...onfly-client/src/resource/persistent_cache_task.rs	0.00% <0.00%> (ø)
dragonfly-client/src/resource/piece_collector.rs	0.00% <0.00%> (ø)
... and 6 more