feat: add block implementation

[hunjixin]

add storage codes

[codecov]

Codecov Report

Merging #13 (0c103b1) into main (93f3da0) will increase coverage by 14.21%.
Report is 1 commits behind head on main.
The diff coverage is 49.19%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #13       +/-   ##
===========================================
+ Coverage   34.61%   48.82%   +14.21%     
===========================================
  Files           5       29       +24     
  Lines         104     4012     +3908     
===========================================
+ Hits           36     1959     +1923     
- Misses         61     1782     +1721     
- Partials        7      271      +264     

Files	Coverage Δ
block/azure/stats.go	100.00% <100.00%> (ø)
block/gs/stats.go	100.00% <100.00%> (ø)
block/s3/stats.go	100.00% <100.00%> (ø)
config/config.go	0.00% <0.00%> (ø)
block/gs/compose.go	68.42% <68.42%> (ø)
block/walker.go	50.00% <50.00%> (ø)
block/s3/client_cache.go	90.36% <90.36%> (ø)
block/blocktest/adapter.go	97.47% <97.47%> (ø)
block/gs/walker.go	75.00% <75.00%> (ø)
block/path.go	84.81% <84.81%> (ø)
... and 15 more