refactor: remove openraft deps, rename all v2 modules

[MrCroxx]

As titled.

Ref: #121 .

[codecov]

Codecov Report

Merging #125 (37e7250) into main (4c32bfb) will increase coverage by 5.04%.
The diff coverage is 67.55%.

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
+ Coverage   78.62%   83.66%   +5.04%     
==========================================
  Files          85       72      -13     
  Lines        9474     6888    -2586     
==========================================
- Hits         7449     5763    -1686     
+ Misses       2025     1125     -900     

Impacted Files	Coverage Δ
storage/src/error.rs	14.28% <ø> (ø)
storage/src/lib.rs	100.00% <ø> (ø)
wheel/src/error.rs	0.00% <ø> (ø)
storage/src/raft_log_store/store.rs	89.80% <50.00%> (-3.59%)	⬇️
wheel/src/service.rs	71.60% <59.21%> (+57.34%)	⬆️
wheel/src/components/raft_log_store.rs	66.87% <66.39%> (+0.94%)	⬆️
storage/src/raft_log_store/block_cache.rs	88.00% <66.66%> (+30.85%)	⬆️
wheel/src/components/fsm.rs	68.78% <67.03%> (+41.95%)	⬆️
storage/src/raft_log_store/mem.rs	81.72% <68.49%> (-3.43%)	⬇️
wheel/src/components/raft_manager.rs	78.70% <76.84%> (-3.60%)	⬇️
... and 13 more

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