feature: ShardingSelector GetMulti 使用 merge

[codecov[bot]]

Codecov Report

Merging #199 (c128352) into dev (08a348c) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #199      +/-   ##
==========================================
+ Coverage   85.91%   85.93%   +0.01%     
==========================================
  Files          45       45              
  Lines        3309     3313       +4     
==========================================
+ Hits         2843     2847       +4     
  Misses        374      374              
  Partials       92       92              

Impacted Files	Coverage Δ
internal/merger/aggregatemerger/merger.go	93.52% <ø> (ø)
internal/merger/batchmerger/merger.go	94.54% <ø> (ø)
internal/merger/pagedmerger/merger.go	96.59% <100.00%> (ø)
internal/merger/sortmerger/merger.go	89.85% <100.00%> (ø)
internal/valuer/primitive.go	100.00% <100.00%> (ø)
internal/valuer/reflect.go	93.87% <100.00%> (ø)
internal/valuer/unsafe.go	100.00% <100.00%> (ø)
sharding_select.go	76.84% <100.00%> (+0.23%)	:arrow_up:

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