ftr: add vitess utils

[dk-lockdown]

What this PR does:
add some util libs for pixiu import

[wongoo]

ref：

• https://github.com/vitessio/vitess/blob/main/go/bucketpool
• https://github.com/vitessio/vitess/blob/main/go/cache
• https://github.com/vitessio/vitess/tree/main/go/sync2

[wongoo]

it's ok after renaming the packages required by AlexStocks.

[codecov-commenter]

Codecov Report

Merging #74 (b8f1e49) into master (4bebd89) will increase coverage by 1.33%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   71.93%   73.27%   +1.33%     
==========================================
  Files          40       45       +5     
  Lines        4280     4550     +270     
==========================================
+ Hits         3079     3334     +255     
- Misses       1001     1013      +12     
- Partials      200      203       +3     

Impacted Files	Coverage Δ
container/gxsync/batcher.go	67.85% <67.85%> (ø)
container/gxbucketpool/bucketpool.go	90.90% <90.90%> (ø)
container/gxsync/semaphore.go	92.85% <92.85%> (ø)
container/gxlru/lru_cache.go	100.00% <100.00%> (ø)
container/gxsync/consolidator.go	100.00% <100.00%> (ø)

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