Fix/Dedup

[iGxnon]

Base on #466

Please briefly answer these questions:

Described in #439, When solving the issue of SP GC, the first step is to handle cmd deduplication and determine if it is complete.

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[codecov]

Codecov Report

Attention: 318 lines in your changes are missing coverage. Please review.

Comparison is base (fe5b7de) 54.17% compared to head (ba97d3a) 53.98%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #450      +/-   ##
==========================================
- Coverage   54.17%   53.98%   -0.19%     
==========================================
  Files         101      103       +2     
  Lines       18239    18979     +740     
  Branches    18239    18979     +740     
==========================================
+ Hits         9881    10246     +365     
- Misses       7768     8142     +374     
- Partials      590      591       +1     

Files	Coverage Δ
curp-test-utils/src/test_cmd.rs	76.19% <100.00%> (+0.30%)	⬆️
curp/src/lib.rs	100.00% <ø> (ø)
curp/src/server/cmd_board.rs	37.59% <100.00%> (+4.52%)	⬆️
curp/src/server/gc.rs	85.29% <ø> (+0.08%)	⬆️
xline-client/src/clients/auth.rs	0.00% <ø> (ø)
curp/src/error.rs	7.89% <0.00%> (-0.68%)	⬇️
curp/src/server/raw_curp/tests.rs	77.03% <82.75%> (+0.65%)	⬆️
curp/src/server/raw_curp/mod.rs	68.00% <86.27%> (+0.75%)	⬆️
curp/src/server/client_lease.rs	87.87% <87.87%> (ø)
curp/src/tracker.rs	91.84% <91.84%> (ø)
... and 5 more

... and 9 files with indirect coverage changes

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