enhance: move segcore codes of segment into one package

[chyezh]

issue: #33285

• move most cgo opeartions related to search/query into segcore package for reusing for streamingnode.
• add go unittest for segcore operations.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.14981% with 106 lines in your changes missing coverage. Please review.

Project coverage is 81.04%. Comparing base (8188e14) to head (4a23f94). Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/util/segcore/segment.go	79.23%	26 Missing and 12 partials :warning:
internal/querynodev2/segments/segment.go	86.77%	9 Missing and 7 partials :warning:
internal/util/segcore/requests.go	69.23%	8 Missing and 4 partials :warning:
internal/util/segcore/reduce.go	9.09%	5 Missing and 5 partials :warning:
internal/querynodev2/segments/collection.go	62.50%	4 Missing and 2 partials :warning:
internal/util/segcore/collection.go	81.25%	4 Missing and 2 partials :warning:
internal/querynodev2/segments/result.go	16.66%	4 Missing and 1 partial :warning:
internal/querynodev2/segments/segment_l0.go	0.00%	3 Missing :warning:
internal/util/segcore/cgo_util.go	88.46%	2 Missing and 1 partial :warning:
internal/util/segcore/responses.go	75.00%	2 Missing and 1 partial :warning:
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #37722       +/-   ##
===========================================
+ Coverage   68.87%   81.04%   +12.17%     
===========================================
  Files         289     1368     +1079     
  Lines       25484   190952   +165468     
===========================================
+ Hits        17551   154764   +137213     
- Misses       7933    30701    +22768     
- Partials        0     5487     +5487     

Components	Coverage Δ
Client	72.33% <ø> (∅)
Core	68.87% <ø> (ø)
Go	83.21% <80.14%> (∅)

Files with missing lines	Coverage Δ
internal/querynodev2/segments/cgo_util.go	28.57% <ø> (ø)
internal/querynodev2/segments/count_reducer.go	100.00% <100.00%> (ø)
internal/querynodev2/segments/reducer.go	90.90% <ø> (ø)
internal/querynodev2/segments/retrieve.go	82.40% <100.00%> (ø)
internal/querynodev2/segments/search.go	63.47% <100.00%> (ø)
internal/querynodev2/segments/segcore.go	100.00% <100.00%> (ø)
internal/querynodev2/segments/segment_loader.go	72.74% <100.00%> (ø)
internal/querynodev2/server.go	77.62% <100.00%> (ø)
internal/querynodev2/tasks/query_stream_task.go	79.16% <100.00%> (ø)
internal/querynodev2/tasks/query_task.go	90.17% <100.00%> (ø)
... and 14 more

... and 1055 files with indirect coverage changes

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[chyezh]

rerun go-sdk

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[chyezh]

/run-cpu-e2e

[chyezh]

rerun cpp-unit-test

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/run-cpu-e2e

[chyezh]

rerun cpp-unit-test

[chyezh]

rerun cpp-unit-test

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/run-cpu-e2e

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rerun cpp-unit-test

[chyezh]

rerun cpp-unit-test

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/run-cpu-e2e

[chyezh]

rerun cpp-unit-test

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