enhance: Refactor hybrid search

[czs007]

issue: #25639 #31368
pr :#32020

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[mergify]

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[zhagnlu]

/lgtm

[samhuang-z]

/run-cpu-e2e

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[codecov]

Codecov Report

Attention: Patch coverage is 74.16667% with 217 lines in your changes are missing coverage. Please review.

Project coverage is 80.52%. Comparing base (3904719) to head (4740140).
Report is 24 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #31742      +/-   ##
==========================================
- Coverage   80.89%   80.52%   -0.38%     
==========================================
  Files         964      973       +9     
  Lines      139422   138888     -534     
==========================================
- Hits       112791   111836     -955     
- Misses      22882    23300     +418     
- Partials     3749     3752       +3     

Files	Coverage Δ
internal/distributed/querynode/client/client.go	92.71% <ø> (+1.76%)	⬆️
internal/distributed/querynode/service.go	81.01% <ø> (+0.74%)	⬆️
internal/proxy/impl.go	86.04% <100.00%> (+<0.01%)	⬆️
internal/querynodev2/handlers.go	79.44% <100.00%> (+1.25%)	⬆️
internal/util/mock/grpc_querynode_client.go	76.00% <ø> (+2.92%)	⬆️
internal/util/wrappers/qn_wrapper.go	72.72% <ø> (-0.81%)	⬇️
internal/querynodev2/services.go	90.26% <75.00%> (+1.98%)	⬆️
internal/proxy/search_reduce_util.go	82.92% <86.13%> (+1.07%)	⬆️
internal/proxy/reScorer.go	70.86% <57.14%> (-5.38%)	⬇️
internal/querynodev2/delegator/delegator.go	89.68% <75.00%> (-2.59%)	⬇️
... and 3 more

... and 243 files with indirect coverage changes

[zhagnlu]

/lgtm