feat: impl raft log store (part 5)

[MrCroxx]

As titled.

Changes:

• Add ctx field to raft log entry meta segment.
• Refactor raft log store.

Ref: #88 .

[codecov[bot]]

Codecov Report

Merging #97 (1eb6119) into main (d434dff) will decrease coverage by 4.06%. The diff coverage is 31.61%.

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   84.96%   80.89%   -4.07%     
==========================================
  Files          62       62              
  Lines        5379     5789     +410     
==========================================
+ Hits         4570     4683     +113     
- Misses        809     1106     +297     

Impacted Files	Coverage Δ
wheel/src/error.rs	0.00% <0.00%> (ø)
wheel/src/storage/raft_log_store.rs	0.00% <0.00%> (ø)
storage/src/raft_log_store/mem.rs	79.57% <44.44%> (-8.43%)	:arrow_down:
storage/src/raft_log_store/store.rs	91.34% <84.14%> (-5.59%)	:arrow_down:
storage/src/raft_log_store/entry.rs	93.91% <98.00%> (+0.64%)	:arrow_up:
storage/src/raft_log_store/log.rs	89.55% <100.00%> (ø)
storage/src/utils/coding.rs	95.17% <100.00%> (+1.93%)	:arrow_up:

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